Sum of elements leetcode.
You are given an integer array nums and an integer k.
Sum of elements leetcode Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. Skip to content Tired of endless grinding? Check out AlgoMonster for a structured approach to coding interviews. length == queries. Can you solve this real interview question? Count of Range Sum - Given an integer array nums and two integers lower and upper, return the number of range sums that lie in [lower, upper] inclusive. Return the maximum sum. You have to find the maximum sum of a pair of numbers from nums such that the largest digit in both numbers is equal. j] is called the distinct count of . Since the Can you solve this real interview question? Make K-Subarray Sums Equal - You are given a 0-indexed integer array arr and an integer k. Given a binary tree with a value associated with each node. Make the XOR of All Segments Equal to Zero 1788. Example 2: Explanation: There are no unique elements, and the We define a running sum of an array as runningSum [i] = sum (nums [0]nums [i]). While root is not null, perform the following steps: If the left child of root is null, add the value of root Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. If the sum is greater than the target, move the right pointer to the left to decrease the sum. The first n elements belonging to the first part and their sum is sum first. Find the maximum sum of any possible subsequence such that no two numbers in the subsequence should be adjacent in array arr. Example 1: Input: nums = [-2,5,-1], lower = -2, upper = 2 Output: 3 You are given an integer n representing the length of an unknown array that you are trying to recover. Example Problems based on Prefix Sum 1. Flip the values from 0 to 1 and from 1 to 0 in nums1 from index l to index r. You may assume that each input would have exactly one solution, and you may not use the same element twice. The distinct count of a subarray of nums is defined as: * Let nums[i. The triangular sum of nums is the value of the only element present in nums after the following process terminates:. A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements. Below is the Step-by-step approach: Iterate through the Then check the sum of the elements at these two pointers: If the sum equals the target, we’ve found the pair. Initially, your score is 0. You can modify any of the elements of nums1 by +1 or -1 at most k1 times. Return the maximum sum or -1 if no such pair exists. The best way is to split it LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. In other words, you do not know the elements of the matrix, but you do know the sums of each row and column. i - k <= r <= i + k, j - k <= c Welcome to Subscribe On Youtube 1748. Sum of Unique Elements; 1749. Return the sum of all the unique elements of nums. Can you solve this real interview question? House Robber - You are a professional robber planning to rob houses along a street. Given a m x n matrix mat and an integer k, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for:. Example 2: Input: Given an integer array nums, return true if you can partition the array into two subsets such that the sum of the elements in both subsets is equal or false otherwise. LeetCode Solutions 2778. Example 1: Input: nums = You are given a 0-indexed integer array nums. You can do the following operation any number of times:. Return the minimum absolute sum difference after replacing at most one element in the array nums1. Otherwise, create a new 0-indexed integer array newNums of length n - 1. Median of Two Sorted Arrays Minimum Elements to Add to Form a Given Sum 1786. For example, 2373 is made up of three distinct digits: 2, 3, and 7, where 7 is the largest among them. Your task is to perform the following operation exactly k times in order to maximize your score: 1. Return the sum of the answers to all queries. Better than official and forum solutions. Return the array arr. For each index i, You are given an array target of n integers. Intuitions, example walk through, and complexity analysis. You are also given two positive integers k1 and k2. Return an array answer where answer. In the case of a tie, it does not matter which number is chosen. Add Two Numbers 3. Difference Between Element Sum and Digit Sum of an Array Description. Return the absolute difference between the element sum and digit sum of nums. 3. Description. length. Minimum Length of String After Deleting Similar Ends; Given a 2D matrix matrix, handle multiple queries of the following type:. The element sum is the sum of all the elements in nums. You are given an integer array nums and an integer k. The maximum pair sum is the largest pair sum in a list of pairs. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1] since 1 divides 4, nums[2] since 2 divides 4, and nums[4] since 4 You are given a 0-indexed integer array nums. Given an integer array nums and an integer k, split nums into k non-empty subarrays such that the largest sum of any subarray is minimized. Example 2: You are given two arrays rowSum and colSum of non-negative integers where rowSum[i] is the sum of the elements in the i th row and colSum[j] is the sum of the elements of the j th column of a 2D matrix. ; Return the sum of the squares of distinct counts of all subarrays of nums. ; The next n elements belonging to the second part and their sum is sum second. Can you solve this real interview question? Ways to Make a Fair Array - You are given an integer array nums. A subarray is a contiguous part of the array. For query i, we first set nums[posi] equal to xi, then we calculate the answer to query i which is the maximum sum of a subsequence of nums where no two adjacent elements are selected. Build and return an integer array result with the same length as nums such that result[i] is equal to the summation of absolute differences between nums[i] and all the other elements in the array. Notice that the index of the elements may change after the removal. ; Return the maximum subarray sum of all the subarrays that meet the conditions. LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Return the minimized largest sum of the split. In other words, result[i] is LeetCode LeetCode 1. Return the sum of all the unique Return the sum of all the unique elements of nums. Example 2: Input: In-depth solution and explanation for LeetCode 1572. * Choose at most k values of nums2[j] at these indices to maximize the total sum. Example 1: Output: 4. The digit sum is the sum of all the digits (not necessarily distinct) that appear in nums. length <= 2 * 10 4 Can you solve this real interview question? Target Sum - You are given an integer array nums and an integer target. Both l and r are 0-indexed. If the index is on the left edge of the array, then the left sum is 0 because there are no elements to the left. Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. A subsequence of nums having length k and consisting of indices i 0 < i 1 < < i k-1 is balanced if the following holds:. Return an integer denoting the maximum possible sum of elements in a balanced The AND sum of a given placement is the sum of the bitwise AND of every number with its respective slot number. This also applies to the right edge of For the two-sum problem, if we fix one of the numbers, say x, we have to scan the entire array to find the next number y, which is value - x where value is the input parameter. Example 1: In-depth solution and explanation for LeetCode 2535. You are given a 0-indexed integer array nums consisting of 3 * n elements. A subarray is a contiguous non-empty sequence of elements within an array. Sum of Squares of Special Elements You are given a 1-indexed integer array nums of length n. * For example, the alternating sum of [4,2,5,3] is (4 + 5) - (2 + 3) = 4. Maximum Sum of Subsequence With Non-adjacent Elements Description You are given an array nums consisting of integers. Can you solve this real interview question? Subarrays Distinct Element Sum of Squares I - You are given a 0-indexed integer array nums. Explanation: There are no Maximum Absolute Sum of Any Subarray. Let nums comprise of n elements. You want to build an expression out of nums by adding one of the symbols '+' and '-' before each integer in nums and then concatenate all the integers. Each element of nums is in exactly one pair, and In-depth solution and explanation for LeetCode 3165. j] be a subarray of nums consisting of all the indices from i to j such that 0 <= i <= j < nums. n % i == 0. Example 1: Input: nums = [1,1,1], k = 2 Output: 2 Example 2: Input: nums = [1,2,3], k = 3 Output: 2 Constraints: * 1 <= nums. There are three types of queries: 1. For the ith query, find the maximum value of nums1[j] + nums2[j] among all indices j (0 <= j < n), where nums1[j] >= xi and nums2[j] >= yi, or -1 if there is no j satisfying the The answer to the i-th query is the sum of all nums[j] where x_i <= j < n and (j - x_i) is divisible by y_i. We define the K-Sum of the array as the k th largest subsequence sum that can be obtained (not necessarily distinct). let x be the sum of all elements currently in your array. The pair sum of a pair (a,b) is equal to a + b. Update the value of an element in nums. if you select ai and aj, i * j must be a perfect square. Example 1: Input: root = [10,5,15,3,7,null,18], low = 7, high = 15 Output: 32 Explanation: Nodes 7, 10, and 15 are in the range [7, 15]. Subarray Sum Equals K Description. ; Given an array nums of even length n, pair up the elements of nums into n / 2 pairs such that:. Sum of Unique Elements Sum of Unique Elements You are given an n x n integer matrix. An element nums[i] of nums is called special if i divides n, i. Select an element m from nums. Return the sum of the squares of all special elements of nums. Example 1: Input: nums = [-2,1,-3,4,-1,2,1,-5,4] Output: 6 Explanation: The Welcome to Subscribe On Youtube 3165. Given an array A[] of N positive integers and two positive integers K1 and K2. Sum of an array between indexes L and R using Prefix Sum: Given an array arr[] of size n. For query i, we first set nums[posi] equal to xi, then we calculate the answer to query i which is the maximum sum of a Can you solve this real interview question? Choose K Elements With Maximum Sum - You are given two integer arrays, nums1 and nums2, both of length n, along with a positive integer k. Example 1: Input: nums = [1,2,3,2] Output: 4 Explanation: The unique elements are [1,3], and the sum is 4. If n == 1, end the process. Then the number of distinct values in nums[i. You are allowed to remove any subsequence of elements of size exactly n from nums. Similarly, you can modify any of the elements of nums2 by +1 or -1 at most k2 times. j] is called the distinct count of nums[i. Given an integer array nums and an integer k, return the maximum sum of a non-empty subsequence of that array such that for every two consecutive integers in the subsequence, nums[i] and nums[j], where i < j, the condition j - i <= k is satisfied. You are given a positive integer array nums. From each row in the matrix, select the largest number and remove it. The array arr is circular. Example 2: Output: 0. Return true if it is possible to construct the target array from Given an integer array nums and two integers firstLen and secondLen, return the maximum sum of elements in two non-overlapping subarrays with lengths firstLen and secondLen. Maximum Alternating Subsequence Sum - The alternating sum of a 0-indexed array is defined as the sum of the elements at even indices minus the sum of the elements at odd indices. If no subarray meets the conditions, return 0. The absolute sum difference of arrays nums1 and nums2 is defined as the sum of |nums1[i] - nums2[i]| for each 0 <= i < n (0-indexed). For each index i from 0 to n - 1, perform the following: * Find all indices j where nums1[j] is less than nums1[i]. NumMatrix(int[][] matrix) Initializes the object with the integer matrix matrix. Two Sum - Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. A subsequence of an array is obtained by deleting some number of elements (can be zero) from the array, leaving the The Geek Hub for Discussions, Learning, and Networking. length and answer[i] is the answer to the i-th query modulo 10^9 + 7 . j]. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1 Can you solve this real interview question? Subarray Sum Equals K - Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. Return the K-Sum of the array. Given an array nums, return the sum of all XOR totals for every subset of nums. 2535. * For example, if nums = [2, 1], you can add a '+' before 2 and a '-' before 1 and concatenate them to build the Can you solve this real interview question? Range Sum Query - Mutable - Given an integer array nums, handle multiple queries of the following types: 1. For example, the XOR total of the array [2,5,6] is 2 XOR 5 XOR 6 = 1. Return the array ans of length n representing the unknown array. Can you solve this real interview question? Sum of Unique Elements - Level up your coding skills and quickly land a job. For each query i, first, apply nums[indexi] = nums[indexi] + vali, then print the sum of the even values of nums. Return any such subsequence as an integer array of length k. You are given an integer array nums. length, where arr[i] is the sum of |i - j| over all j such that nums[j] == nums[i] and j != i. Two combinations are 3165. ; A subsequence of nums having length 1 is considered balanced. Sum of All Subset XOR Totals Description The XOR total of an array is defined as the bitwise XOR of all its elements, or 0 if the array is empty. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1] since 1 divides 4, nums[2] since 2 divides 4, and nums[4] since 4 Can you solve this real interview question? Sum in a Matrix - You are given a 0-indexed 2D integer array nums. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems connected and it will automatically contact the police if two adjacent houses were Maximum Element-Sum of a Complete Subset of Indices - You are given a 1-indexed array nums. LeetCode Solutions 1748. Given an array of integers nums, calculate the pivot index of this array. The sum of squared difference of arrays nums1 and nums2 is defined as the sum of (nums1[i] - nums2[i])2 for each 0 <= i < n. Matrix Diagonal Sum in Python, Java, C++ and more. ; choose index i, such that 0 <= i < n and set the value of arr at index i to x. Longest Substring Without Repeating Characters 4. Example 1: Input: nums = [1,1,1], k = 2 Output: 2 Example 2: Input: nums = [1,2,3], k = 3 Output: 2 Constraints: 1 <= nums. It may be assumed that (1 <= k1 < k2 <= n). Example 1: Input: nums = [7,2,5,10,8], k = 2 Output: 18 Explanation: There are four ways to split nums into two subarrays. You can replace at most one element of nums1 with any other element in nums1 to minimize the absolute sum difference. Given q queries and in each query given i and j, Print the sum of array elements from index i to j. Return an integer array answer where answer[i] is the answer to the ith query. Initialize a pointer root to the root of the binary tree. Difference Between Element Sum and Digit Sum of an Array in Python, Java, C++ and more. Matrix Diagonal Sum Description Given a square matrix mat, return the sum of the matrix diagonals. Example 1: Input: grid = [[1,2],[3,4]], limits = [1,2], k = 2 Output: 7 Explanation: * From the second row, we can take at most 2 elements. Maximum Sum of Subsequence With Non-adjacent Elements in Python, Java, C++ and more. Can you solve this real interview question? Maximum Sum Queries - You are given two 0-indexed integer arrays nums1 and nums2, each of length n, and a 1-indexed 2D array queries where queries[i] = [xi, yi]. Add a new element with a value of m + 1 to the array. If there is no such element, leftSum[i] = 0. Use this pattern when Chapters: 00:00 - Intro 00:40 - Problem Statement 02:23 - Brute Force Method 04:01 - Frequency Array 08:21 - Dry-run of Code 10:26 - Final Thoughts 📚 Links to topics I talk Return the sum of all the unique elements of nums. e. You may return the combinations in any order. You can do the following operation any number of Can you solve this real interview question? Combination Sum - Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. * rightSum[i] is the sum of elements to the right of the index i in the array nums. Your task is to select a complete subset from nums where every pair of selected indices multiplied is a perfect square,. Define two arrays leftSum and rightSum where: * leftSum[i] is the sum of elements to the left of the index i in the array nums. Note: Subsets with the Can you solve this real interview question? Sum of Squares of Special Elements - You are given a 1-indexed integer array nums of length n. i. Examples: Input: arr[] = [5, 5, 10, 100, 10, 5] Output: 1748. * For example, the AND sum of placing the numbers [1, 3] into slot 1 and [4, 6] into slot 2 is equal to (1 AND 1) + (3 AND 1) + (4 AND 2) + (6 AND 2) = 1 + 1 + 0 + 2 = 4. If multiple answers exist, return any of them. Return the sum of the complete subset with the maximum sum. For every arr[i], use the hashing based solution of 2 Sum Problem to check if there is a pair with sum equal to given sum – arr[i] . Exa Can you solve this real interview question? Sum of Distances - You are given a 0-indexed integer array nums. Example 1: Input: nums = [1,3,1,1,2] Output: [5,0,3,4,0] Explanation: When i = 0, nums You are given an array nums consisting of integers. ; Return the absolute difference between the element sum and digit sum of nums. Return the maximum possible AND sum of nums given numSlots slots. Return the maximum sum of the matrix's elements using the operation The idea is to traverse every element arr[i] in a loop. Calculate the sum of the elements of nums between indices left and right inclusive where left <= right. The array with length firstLen could occur before or after the array with length secondLen, but they have to be non-overlapping. Identify the highest number The task is to find the maximum sum of at most k elements from the matrix grid such that: * The number of elements taken from the ith row of grid does not exceed limits[i]. For a query of type 1, queries[i] = [1, l, r]. Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal. The distinct count of a subarray of nums is defined as:. Time Complexity: O(n), as we are traversing the array only once. Two Sum 2. The unique elements of an array are the elements that appear exactly once in the array. This is the best place to expand your knowledge and get prepared for your next interview. Then the number of distinct values in nums[i. Example 1: Input: nums = [1,2,3,2] Output: 4 Explanation: The unique elements are [1,3], and Given an array arr containing positive integers. Sum of Unique Elements Level. Your task is to select a subset of nodes such that the sum of their values is maximized, with the condition that no two selected nodes are directly connected that is, if a node is included i Can you solve this real interview question? Sum of Even Numbers After Queries - You are given an integer array nums and an array queries where queries[i] = [vali, indexi]. Maximum Sum With Exactly K Elements - You are given a 0-indexed integer array nums and an integer k. Example 1: Input: nums = [1,2,3,2] Output: 4. nums[i j] - nums[i j-1] >= i j - i j-1, for every j in the range [1, k - 1]. Find any matrix of non-negative integers of size rowSum. Find the maximum subarray sum of all the subarrays of nums that meet the following conditions:. Choose any two adjacent elements of matrix and multiply each of them by -1. A subarray is a contiguous part of an array. Implement the NumArray class: * NumArray(int[] nums) Initializes the object with the Can you solve this real interview question? Sum of Unique Elements - You are given an integer array nums. Example 1: You are given a 0-indexed integer array nums. In other words, the first element of the array is the next element of the last element, and the last element of the array is the previous element of the first element. There exists an array arr of length nums. You are also given an array sums containing the values of all 2 n subset sums of the unknown array (in no particular order). Minimum Length of String After Deleting Similar Ends; Welcome to Subscribe On Youtube 1863. Since the answer may be large, return the answer modulo 109 + 7. You want to find a subsequence of nums of length k that has the largest sum. Left and Right Sum Differences - You are given a 0-indexed integer array nums of size n. Example 1: Input: nums = [1,2,3,4] Output: [1,3,6,10] Explanation: Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. An array sub is a subset of an array arr if Given an integer array nums, find the subarray with the largest sum, and return its sum. 7 + 10 + 15 = 32. * Choosing to remove index 2 results Welcome to Subscribe On Youtube 1572. Maximum Absolute Sum of Any Subarray; 1750. 4. length Initialize a variable sum to 0 to keep track of the sum of all nodes in the binary tree. Given the root node of a binary search tree and two integers low and high, return the sum of values of all nodes with a value in the inclusive range [low, high]. For example, if nums = [6,1,7,4,1]: * Choosing to remove index 1 results in nums = [6,7,4,1]. Sum of Unique Elements - You are given an integer array nums. If the sum is less than the target, move the left pointer to the right to increase the sum. int sumRegion(int row1, int col1, int row2, int col2 Sum of Subarray Minimums - Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Sum of Unique Elements - You are given an integer array nums. Input: [1, 2, 3, 5] Output: false Explanation: The array cannot be partitioned into equal sum subsets. Example 1: Explanation: The unique elements are [1,3], and the sum is 4. You are also given a 2D array queries, where queries[i] = [posi, xi]. Calculate the sum of the elements of matrix inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Can you solve this real interview question? Matrix Diagonal Sum - Given a square matrix mat, return the sum of the matrix diagonals. For example, if we have pairs (1,5), (2,3), and (4,4), the maximum pair sum would be max(1+5, 2+3, 4+4) = max(6, 5, 8) = 8. Explanation: The unique elements are [1,3], and the sum is 4. The pivot index is the index where the sum of all the numbers strictly to the left of the index is equal to the sum of all the numbers strictly to the index's right. Can you solve this real interview question? Sum of Unique Elements - You are given an integer array nums. ; Two elements are considered adjacent if and only if they share a border. This allows for efficient sum queries on subarrays. Return the running sum of nums. In-depth solution and explanation for LeetCode 523. Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j inclusive, where i <= j. For a query of type 2, queries[i You are given a 1-indexed integer array nums of length n. Perform the following operations until the matrix becomes empty: 1. Your goal is to maximize the summation of the matrix's elements. Illustration: C++ You are given an integer array nums and a positive integer k. Only include the sum of all the elements on the primary Max Pair Sum in an Array - You are given an integer array nums. Sum of Unique Elements Description You are given an integer array nums. Let nums[i. ; The digit sum is the sum of all the digits (not necessarily distinct) that appear in nums. e. The same number may be chosen from candidates an unlimited number of times. ; Implement the NumMatrix class:. Example 2: Input: nums = [1,2,3,5] Output: false Explanation: The array cannot be partitioned into equal 560. Example 1: Input: nums = [1,5,11,5] Output: true Explanation: The array can be partitioned as [1, 5, 5] and [11]. The length of the subarray is k, and; All the elements of the subarray are distinct. Find the sum of all elements between K1th and K2th smallest elements of the array. You can choose any subsequence of the array and sum all of its elements together. If there is no such j, set arr[i] to be 0. Number of Restricted Paths From First to Last Node 1787. You are given a 0-indexed integer array nums, where nums[i] is a digit between 0 and 9 (inclusive). Continuous Subarray Sum in Python, Java, C++ and more. The remaining 2 * n elements will be divided into two equal parts:. Example 2: Input: root = [10,5,15,3,7,13,18,1,null,6], low = 6, Maximum Sum With Exactly K Elements - You are given a 0-indexed integer array nums and an integer k. Note that the absolute difference between two integers x and y is defined as |x - y|. Example 2: Prefix Sum involves preprocessing an array to create a new array where each element at index i represents the sum of the array from the start up to i. 不包含相邻元素的子序列的最大和 - 给你一个整数数组 nums 和一个二维数组 queries，其中 queries[i] = [posi, xi]。 对于每个查询 i，首先将 nums[posi] 设置为 xi，然后计算查询 i 的答案，该答案为 nums 中 不包含相邻元素 的 子序列 的 最大 和。 返回所有查询的答案之和。 Can you solve this real interview question? Sum of Absolute Differences in a Sorted Array - You are given an integer array nums sorted in non-decreasing order. Remove the selected element m from the array. A subsequence is an array that can be derived from another array by deleting some or You are given an integer array nums and an integer k. Auxiliary Space: O(n), to create the array prefxSum[] of size n. Easy. ; You may repeat this procedure as many times as needed. From a starting array arr consisting of n 1's, you may perform the following procedure :. 2. . length x Can you solve this real interview question? Handling Sum Queries After Update - You are given two 0-indexed arrays nums1 and nums2 and a 2D array queries of queries. You can choose exactly one index (0-indexed) and remove the element. vltbv okvfh rnc lojcr urkn eki cqfq lllf dbxw eanan rxcx brcee emxpd maop xzoxm
Sum of elements leetcode.
You are given an integer array nums and an integer k.
Sum of elements leetcode Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. Skip to content Tired of endless grinding? Check out AlgoMonster for a structured approach to coding interviews. length == queries. Can you solve this real interview question? Count of Range Sum - Given an integer array nums and two integers lower and upper, return the number of range sums that lie in [lower, upper] inclusive. Return the maximum sum. You have to find the maximum sum of a pair of numbers from nums such that the largest digit in both numbers is equal. j] is called the distinct count of . Since the Can you solve this real interview question? Make K-Subarray Sums Equal - You are given a 0-indexed integer array arr and an integer k. Given a binary tree with a value associated with each node. Make the XOR of All Segments Equal to Zero 1788. Example 2: Explanation: There are no unique elements, and the We define a running sum of an array as runningSum [i] = sum (nums [0]nums [i]). While root is not null, perform the following steps: If the left child of root is null, add the value of root Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. If the sum is greater than the target, move the right pointer to the left to decrease the sum. The first n elements belonging to the first part and their sum is sum first. Find the maximum sum of any possible subsequence such that no two numbers in the subsequence should be adjacent in array arr. Example 1: Input: nums = [-2,5,-1], lower = -2, upper = 2 Output: 3 You are given an integer n representing the length of an unknown array that you are trying to recover. Example Problems based on Prefix Sum 1. Flip the values from 0 to 1 and from 1 to 0 in nums1 from index l to index r. You may assume that each input would have exactly one solution, and you may not use the same element twice. The distinct count of a subarray of nums is defined as: * Let nums[i. The triangular sum of nums is the value of the only element present in nums after the following process terminates:. A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements. Below is the Step-by-step approach: Iterate through the Then check the sum of the elements at these two pointers: If the sum equals the target, we’ve found the pair. Initially, your score is 0. You can modify any of the elements of nums1 by +1 or -1 at most k1 times. Return the maximum sum or -1 if no such pair exists. The best way is to split it LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. In other words, you do not know the elements of the matrix, but you do know the sums of each row and column. i - k <= r <= i + k, j - k <= c Welcome to Subscribe On Youtube 1748. Sum of Unique Elements; 1749. Return the sum of all the unique elements of nums. Can you solve this real interview question? House Robber - You are a professional robber planning to rob houses along a street. Given a m x n matrix mat and an integer k, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for:. Example 2: Input: Given an integer array nums, return true if you can partition the array into two subsets such that the sum of the elements in both subsets is equal or false otherwise. LeetCode Solutions 2778. Example 1: Input: nums = You are given a 0-indexed integer array nums. You can do the following operation any number of times:. Return the minimum absolute sum difference after replacing at most one element in the array nums1. Otherwise, create a new 0-indexed integer array newNums of length n - 1. Median of Two Sorted Arrays Minimum Elements to Add to Form a Given Sum 1786. For example, 2373 is made up of three distinct digits: 2, 3, and 7, where 7 is the largest among them. Your task is to perform the following operation exactly k times in order to maximize your score: 1. Return the sum of the answers to all queries. Better than official and forum solutions. Return the array arr. For each index i, You are given an array target of n integers. Intuitions, example walk through, and complexity analysis. You are also given two positive integers k1 and k2. Return an array answer where answer. In the case of a tie, it does not matter which number is chosen. Add Two Numbers 3. Difference Between Element Sum and Digit Sum of an Array Description. Return the absolute difference between the element sum and digit sum of nums. 3. Description. length. Minimum Length of String After Deleting Similar Ends; Given a 2D matrix matrix, handle multiple queries of the following type:. The element sum is the sum of all the elements in nums. You are given an integer array nums and an integer k. The maximum pair sum is the largest pair sum in a list of pairs. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1] since 1 divides 4, nums[2] since 2 divides 4, and nums[4] since 4 You are given a 0-indexed integer array nums. Given an integer array nums and an integer k, split nums into k non-empty subarrays such that the largest sum of any subarray is minimized. Example 2: You are given two arrays rowSum and colSum of non-negative integers where rowSum[i] is the sum of the elements in the i th row and colSum[j] is the sum of the elements of the j th column of a 2D matrix. ; Return the sum of the squares of distinct counts of all subarrays of nums. ; The next n elements belonging to the second part and their sum is sum second. Can you solve this real interview question? Ways to Make a Fair Array - You are given an integer array nums. A subarray is a contiguous part of the array. For query i, we first set nums[posi] equal to xi, then we calculate the answer to query i which is the maximum sum of a subsequence of nums where no two adjacent elements are selected. Build and return an integer array result with the same length as nums such that result[i] is equal to the summation of absolute differences between nums[i] and all the other elements in the array. Notice that the index of the elements may change after the removal. ; Return the maximum subarray sum of all the subarrays that meet the conditions. LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Return the minimized largest sum of the split. In other words, result[i] is LeetCode LeetCode 1. Return the sum of all the unique Return the sum of all the unique elements of nums. Example 2: Input: In-depth solution and explanation for LeetCode 1572. * Choose at most k values of nums2[j] at these indices to maximize the total sum. Example 1: Output: 4. The digit sum is the sum of all the digits (not necessarily distinct) that appear in nums. length <= 2 * 10 4 Can you solve this real interview question? Target Sum - You are given an integer array nums and an integer target. Both l and r are 0-indexed. If the index is on the left edge of the array, then the left sum is 0 because there are no elements to the left. Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. A subsequence of nums having length k and consisting of indices i 0 < i 1 < < i k-1 is balanced if the following holds:. Return an integer denoting the maximum possible sum of elements in a balanced The AND sum of a given placement is the sum of the bitwise AND of every number with its respective slot number. This also applies to the right edge of For the two-sum problem, if we fix one of the numbers, say x, we have to scan the entire array to find the next number y, which is value - x where value is the input parameter. Example 1: In-depth solution and explanation for LeetCode 2535. You are given a 0-indexed integer array nums consisting of 3 * n elements. A subarray is a contiguous non-empty sequence of elements within an array. Sum of Squares of Special Elements You are given a 1-indexed integer array nums of length n. * For example, the alternating sum of [4,2,5,3] is (4 + 5) - (2 + 3) = 4. Maximum Sum of Subsequence With Non-adjacent Elements Description You are given an array nums consisting of integers. Can you solve this real interview question? Subarrays Distinct Element Sum of Squares I - You are given a 0-indexed integer array nums. Explanation: There are no Maximum Absolute Sum of Any Subarray. Let nums comprise of n elements. You want to build an expression out of nums by adding one of the symbols '+' and '-' before each integer in nums and then concatenate all the integers. Each element of nums is in exactly one pair, and In-depth solution and explanation for LeetCode 3165. j] be a subarray of nums consisting of all the indices from i to j such that 0 <= i <= j < nums. n % i == 0. Example 1: Input: nums = [1,1,1], k = 2 Output: 2 Example 2: Input: nums = [1,2,3], k = 3 Output: 2 Constraints: * 1 <= nums. There are three types of queries: 1. For the ith query, find the maximum value of nums1[j] + nums2[j] among all indices j (0 <= j < n), where nums1[j] >= xi and nums2[j] >= yi, or -1 if there is no j satisfying the The answer to the i-th query is the sum of all nums[j] where x_i <= j < n and (j - x_i) is divisible by y_i. We define the K-Sum of the array as the k th largest subsequence sum that can be obtained (not necessarily distinct). let x be the sum of all elements currently in your array. The pair sum of a pair (a,b) is equal to a + b. Update the value of an element in nums. if you select ai and aj, i * j must be a perfect square. Example 1: Input: root = [10,5,15,3,7,null,18], low = 7, high = 15 Output: 32 Explanation: Nodes 7, 10, and 15 are in the range [7, 15]. Subarray Sum Equals K Description. ; Given an array nums of even length n, pair up the elements of nums into n / 2 pairs such that:. Sum of Unique Elements Sum of Unique Elements You are given an n x n integer matrix. An element nums[i] of nums is called special if i divides n, i. Select an element m from nums. Return the sum of the squares of all special elements of nums. Example 1: Input: nums = [-2,1,-3,4,-1,2,1,-5,4] Output: 6 Explanation: The Welcome to Subscribe On Youtube 3165. Given an array A[] of N positive integers and two positive integers K1 and K2. Sum of an array between indexes L and R using Prefix Sum: Given an array arr[] of size n. For query i, we first set nums[posi] equal to xi, then we calculate the answer to query i which is the maximum sum of a Can you solve this real interview question? Choose K Elements With Maximum Sum - You are given two integer arrays, nums1 and nums2, both of length n, along with a positive integer k. Example 1: Input: nums = [1,2,3,2] Output: 4 Explanation: The unique elements are [1,3], and the sum is 4. If n == 1, end the process. Then the number of distinct values in nums[i. You are allowed to remove any subsequence of elements of size exactly n from nums. Similarly, you can modify any of the elements of nums2 by +1 or -1 at most k2 times. j] is called the distinct count of nums[i. Given an integer array nums and an integer k, return the maximum sum of a non-empty subsequence of that array such that for every two consecutive integers in the subsequence, nums[i] and nums[j], where i < j, the condition j - i <= k is satisfied. You are given a positive integer array nums. From each row in the matrix, select the largest number and remove it. The array arr is circular. Example 2: Output: 0. Return true if it is possible to construct the target array from Given an integer array nums and two integers firstLen and secondLen, return the maximum sum of elements in two non-overlapping subarrays with lengths firstLen and secondLen. Maximum Alternating Subsequence Sum - The alternating sum of a 0-indexed array is defined as the sum of the elements at even indices minus the sum of the elements at odd indices. If no subarray meets the conditions, return 0. The absolute sum difference of arrays nums1 and nums2 is defined as the sum of |nums1[i] - nums2[i]| for each 0 <= i < n (0-indexed). For each index i from 0 to n - 1, perform the following: * Find all indices j where nums1[j] is less than nums1[i]. NumMatrix(int[][] matrix) Initializes the object with the integer matrix matrix. Two Sum - Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. A subsequence of an array is obtained by deleting some number of elements (can be zero) from the array, leaving the The Geek Hub for Discussions, Learning, and Networking. length and answer[i] is the answer to the i-th query modulo 10^9 + 7 . j]. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1 Can you solve this real interview question? Subarray Sum Equals K - Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. Return the K-Sum of the array. Given an array nums, return the sum of all XOR totals for every subset of nums. 2535. * For example, if nums = [2, 1], you can add a '+' before 2 and a '-' before 1 and concatenate them to build the Can you solve this real interview question? Range Sum Query - Mutable - Given an integer array nums, handle multiple queries of the following types: 1. For example, the XOR total of the array [2,5,6] is 2 XOR 5 XOR 6 = 1. Return the array ans of length n representing the unknown array. Can you solve this real interview question? Sum of Unique Elements - Level up your coding skills and quickly land a job. For each query i, first, apply nums[indexi] = nums[indexi] + vali, then print the sum of the even values of nums. Return any such subsequence as an integer array of length k. You are given an integer array nums. length, where arr[i] is the sum of |i - j| over all j such that nums[j] == nums[i] and j != i. Two combinations are 3165. ; A subsequence of nums having length 1 is considered balanced. Sum of All Subset XOR Totals Description The XOR total of an array is defined as the bitwise XOR of all its elements, or 0 if the array is empty. Example 1: Input: nums = [1,2,3,4] Output: 21 Explanation: There are exactly 3 special elements in nums: nums[1] since 1 divides 4, nums[2] since 2 divides 4, and nums[4] since 4 Can you solve this real interview question? Sum in a Matrix - You are given a 0-indexed 2D integer array nums. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems connected and it will automatically contact the police if two adjacent houses were Maximum Element-Sum of a Complete Subset of Indices - You are given a 1-indexed array nums. LeetCode Solutions 1748. Given an array of integers nums, calculate the pivot index of this array. The sum of squared difference of arrays nums1 and nums2 is defined as the sum of (nums1[i] - nums2[i])2 for each 0 <= i < n. Matrix Diagonal Sum in Python, Java, C++ and more. ; choose index i, such that 0 <= i < n and set the value of arr at index i to x. Longest Substring Without Repeating Characters 4. Example 1: Input: nums = [1,1,1], k = 2 Output: 2 Example 2: Input: nums = [1,2,3], k = 3 Output: 2 Constraints: 1 <= nums. It may be assumed that (1 <= k1 < k2 <= n). Example 1: Input: nums = [7,2,5,10,8], k = 2 Output: 18 Explanation: There are four ways to split nums into two subarrays. You can replace at most one element of nums1 with any other element in nums1 to minimize the absolute sum difference. Given q queries and in each query given i and j, Print the sum of array elements from index i to j. Return an integer array answer where answer[i] is the answer to the ith query. Initialize a pointer root to the root of the binary tree. Difference Between Element Sum and Digit Sum of an Array in Python, Java, C++ and more. Matrix Diagonal Sum Description Given a square matrix mat, return the sum of the matrix diagonals. Example 1: Input: grid = [[1,2],[3,4]], limits = [1,2], k = 2 Output: 7 Explanation: * From the second row, we can take at most 2 elements. Maximum Sum of Subsequence With Non-adjacent Elements in Python, Java, C++ and more. Can you solve this real interview question? Maximum Sum Queries - You are given two 0-indexed integer arrays nums1 and nums2, each of length n, and a 1-indexed 2D array queries where queries[i] = [xi, yi]. Add a new element with a value of m + 1 to the array. If there is no such element, leftSum[i] = 0. Use this pattern when Chapters: 00:00 - Intro 00:40 - Problem Statement 02:23 - Brute Force Method 04:01 - Frequency Array 08:21 - Dry-run of Code 10:26 - Final Thoughts 📚 Links to topics I talk Return the sum of all the unique elements of nums. e. You may return the combinations in any order. You can do the following operation any number of Can you solve this real interview question? Combination Sum - Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. * rightSum[i] is the sum of elements to the right of the index i in the array nums. Your task is to select a complete subset from nums where every pair of selected indices multiplied is a perfect square,. Define two arrays leftSum and rightSum where: * leftSum[i] is the sum of elements to the left of the index i in the array nums. Note: Subsets with the Can you solve this real interview question? Sum of Squares of Special Elements - You are given a 1-indexed integer array nums of length n. i. Examples: Input: arr[] = [5, 5, 10, 100, 10, 5] Output: 1748. * For example, the AND sum of placing the numbers [1, 3] into slot 1 and [4, 6] into slot 2 is equal to (1 AND 1) + (3 AND 1) + (4 AND 2) + (6 AND 2) = 1 + 1 + 0 + 2 = 4. If multiple answers exist, return any of them. Return the sum of the complete subset with the maximum sum. For every arr[i], use the hashing based solution of 2 Sum Problem to check if there is a pair with sum equal to given sum – arr[i] . Exa Can you solve this real interview question? Sum of Distances - You are given a 0-indexed integer array nums. Example 1: Input: nums = [1,3,1,1,2] Output: [5,0,3,4,0] Explanation: When i = 0, nums You are given an array nums consisting of integers. ; Return the absolute difference between the element sum and digit sum of nums. Return the maximum possible AND sum of nums given numSlots slots. Return the maximum sum of the matrix's elements using the operation The idea is to traverse every element arr[i] in a loop. Calculate the sum of the elements of nums between indices left and right inclusive where left <= right. The array with length firstLen could occur before or after the array with length secondLen, but they have to be non-overlapping. Identify the highest number The task is to find the maximum sum of at most k elements from the matrix grid such that: * The number of elements taken from the ith row of grid does not exceed limits[i]. For a query of type 1, queries[i] = [1, l, r]. Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal. The distinct count of a subarray of nums is defined as:. Time Complexity: O(n), as we are traversing the array only once. Two Sum 2. The unique elements of an array are the elements that appear exactly once in the array. This is the best place to expand your knowledge and get prepared for your next interview. Then the number of distinct values in nums[i. Example 1: Input: nums = [1,2,3,2] Output: 4 Explanation: The unique elements are [1,3], and Given an array arr containing positive integers. Sum of Unique Elements Level. Your task is to select a subset of nodes such that the sum of their values is maximized, with the condition that no two selected nodes are directly connected that is, if a node is included i Can you solve this real interview question? Sum of Even Numbers After Queries - You are given an integer array nums and an array queries where queries[i] = [vali, indexi]. Maximum Sum With Exactly K Elements - You are given a 0-indexed integer array nums and an integer k. Example 1: Input: nums = [1,2,3,2] Output: 4. nums[i j] - nums[i j-1] >= i j - i j-1, for every j in the range [1, k - 1]. Find any matrix of non-negative integers of size rowSum. Find the maximum subarray sum of all the subarrays of nums that meet the following conditions:. Choose any two adjacent elements of matrix and multiply each of them by -1. A subarray is a contiguous part of an array. Implement the NumArray class: * NumArray(int[] nums) Initializes the object with the Can you solve this real interview question? Sum of Unique Elements - You are given an integer array nums. Example 1: You are given a 0-indexed integer array nums. In other words, the first element of the array is the next element of the last element, and the last element of the array is the previous element of the first element. There exists an array arr of length nums. You are also given an array sums containing the values of all 2 n subset sums of the unknown array (in no particular order). Minimum Length of String After Deleting Similar Ends; Welcome to Subscribe On Youtube 1863. Since the answer may be large, return the answer modulo 109 + 7. You want to find a subsequence of nums of length k that has the largest sum. Left and Right Sum Differences - You are given a 0-indexed integer array nums of size n. Example 1: Input: nums = [1,2,3,4] Output: [1,3,6,10] Explanation: Maximum Sum of Subsequence With Non-adjacent Elements - You are given an array nums consisting of integers. An array sub is a subset of an array arr if Given an integer array nums, find the subarray with the largest sum, and return its sum. 7 + 10 + 15 = 32. * Choosing to remove index 2 results Welcome to Subscribe On Youtube 1572. Maximum Absolute Sum of Any Subarray; 1750. 4. length Initialize a variable sum to 0 to keep track of the sum of all nodes in the binary tree. Given the root node of a binary search tree and two integers low and high, return the sum of values of all nodes with a value in the inclusive range [low, high]. For example, if nums = [6,1,7,4,1]: * Choosing to remove index 1 results in nums = [6,7,4,1]. Sum of Unique Elements - You are given an integer array nums. If the sum is less than the target, move the left pointer to the right to increase the sum. int sumRegion(int row1, int col1, int row2, int col2 Sum of Subarray Minimums - Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Sum of Unique Elements - You are given an integer array nums. Input: [1, 2, 3, 5] Output: false Explanation: The array cannot be partitioned into equal sum subsets. Example 1: Explanation: The unique elements are [1,3], and the sum is 4. You are also given a 2D array queries, where queries[i] = [posi, xi]. Calculate the sum of the elements of matrix inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Can you solve this real interview question? Matrix Diagonal Sum - Given a square matrix mat, return the sum of the matrix diagonals. For example, if we have pairs (1,5), (2,3), and (4,4), the maximum pair sum would be max(1+5, 2+3, 4+4) = max(6, 5, 8) = 8. Explanation: The unique elements are [1,3], and the sum is 4. The pivot index is the index where the sum of all the numbers strictly to the left of the index is equal to the sum of all the numbers strictly to the index's right. Can you solve this real interview question? Sum of Unique Elements - You are given an integer array nums. ; Two elements are considered adjacent if and only if they share a border. This allows for efficient sum queries on subarrays. Return the running sum of nums. In-depth solution and explanation for LeetCode 523. Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j inclusive, where i <= j. For a query of type 2, queries[i You are given a 1-indexed integer array nums of length n. Perform the following operations until the matrix becomes empty: 1. Your goal is to maximize the summation of the matrix's elements. Illustration: C++ You are given an integer array nums and a positive integer k. Only include the sum of all the elements on the primary Max Pair Sum in an Array - You are given an integer array nums. Sum of Unique Elements Description You are given an integer array nums. Let nums[i. ; The digit sum is the sum of all the digits (not necessarily distinct) that appear in nums. e. The same number may be chosen from candidates an unlimited number of times. ; Implement the NumMatrix class:. Example 2: Input: nums = [1,2,3,5] Output: false Explanation: The array cannot be partitioned into equal 560. Example 1: Input: nums = [1,5,11,5] Output: true Explanation: The array can be partitioned as [1, 5, 5] and [11]. The length of the subarray is k, and; All the elements of the subarray are distinct. Find the sum of all elements between K1th and K2th smallest elements of the array. You can choose any subsequence of the array and sum all of its elements together. If there is no such j, set arr[i] to be 0. Number of Restricted Paths From First to Last Node 1787. You are given a 0-indexed integer array nums, where nums[i] is a digit between 0 and 9 (inclusive). Continuous Subarray Sum in Python, Java, C++ and more. The remaining 2 * n elements will be divided into two equal parts:. Example 2: Input: root = [10,5,15,3,7,13,18,1,null,6], low = 6, Maximum Sum With Exactly K Elements - You are given a 0-indexed integer array nums and an integer k. Note that the absolute difference between two integers x and y is defined as |x - y|. Example 2: Prefix Sum involves preprocessing an array to create a new array where each element at index i represents the sum of the array from the start up to i. 不包含相邻元素的子序列的最大和 - 给你一个整数数组 nums 和一个二维数组 queries，其中 queries[i] = [posi, xi]。 对于每个查询 i，首先将 nums[posi] 设置为 xi，然后计算查询 i 的答案，该答案为 nums 中 不包含相邻元素 的 子序列 的 最大 和。 返回所有查询的答案之和。 Can you solve this real interview question? Sum of Absolute Differences in a Sorted Array - You are given an integer array nums sorted in non-decreasing order. Remove the selected element m from the array. A subsequence is an array that can be derived from another array by deleting some or You are given an integer array nums and an integer k. Auxiliary Space: O(n), to create the array prefxSum[] of size n. Easy. ; You may repeat this procedure as many times as needed. From a starting array arr consisting of n 1's, you may perform the following procedure :. 2. . length x Can you solve this real interview question? Handling Sum Queries After Update - You are given two 0-indexed arrays nums1 and nums2 and a 2D array queries of queries. You can choose exactly one index (0-indexed) and remove the element. vltbv okvfh rnc lojcr urkn eki cqfq lllf dbxw eanan rxcx brcee emxpd maop xzoxm