Freaks City

Problem Statement Given an n×m integer matrix and q queries, each query specifies the coordinates of the top-left and bottom-right corners of a submatrix. For each query, compute the sum of all elements within the specified submatrix. Solution Approach The problem can be efficiently solved using 2D prefix sums. By precomputing the cumulative su ...

1. Prefix Sum Technique 1.1 One-Dimensional Prefix Sum The prefix sum algorithm is an optimization technique used to calculate the sum of elements within a specific range $[L, R]$ in $O(1)$ time after an $O(N)$ preprocessing step. In a naive approach, calculating range sums repeatedly would result in $O(N \times M)$ complexity for $M$ queries; ...

Problem Overview Given a positive integer array nums and m queries, each query asks for the minimum number of operations to transform all elements in nums to a target value q. One operation allows incrementing or decrementing a single element by 1. The array resets to its original state after each query. Solution Approach For each target value, ...

Problem Statement Given a integer array nums of length n (0-indexed) and an integer k, you may perform the following operation at most k times: Select any element and multiply it by 2 Return the maximum value of nums[0] | nums[1] | ... | nums[n - 1], where a | b denotes the bitwise OR operation. Examples: Example 1: Input: nums = [12,9], k = ...