Number of Black Blocks at Square

Problem Description

You are given two integers `m` and `n` representing the dimensions of a **0-indexed**  `m x n` grid. You are also given a **0-indexed** 2D integer matrix `coordinates`, where `coordinates[i] = [x, y]` indicates that the cell with coordinates `[x, y]` is colored **black**. All cells in the grid that...

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