Given a 2D grid map of `m` rows and `n` columns initially filled with water, perform `addLand` operations that turn the water at specific positions into land. Return the number of islands after each operation. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically.
Given a 2D matrix, handle multiple queries of the following types - updating the value of a cell and calculating the sum of elements inside a rectangle defined by its upper left and lower right corners.
Given an image represented by a binary matrix where 0 is a white pixel and 1 is a black pixel, return the area of the smallest rectangle that encloses all black pixels. The black pixels are connected, and the rectangle must be axis-aligned.
This is a solution to the Split Array Largest Sum problem on LeetCode.
A concatenated string is a string that exactly contains all the strings of any permutation of `words` concatenated.
This is a solution to the Vertical Order Traversal of a Binary Tree problem on LeetCode.