Problem Statement — Partition Labels LeetCode Solution — You are given a string s. We want to partition the string into as many parts as possible so that each letter appears in at most one part. Note that the partition is done so that after concatenating all the parts in order, the resultant string…

Problem Statement — Range Sum Query 2D — Immutable Leetcode Solution — Given a 2D matrix matrix, handle multiple queries of the following type: — 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). Implement the NumMatrix class…