Grokking Graph Algorithms for Coding Interviews
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Coloring A Border (medium)
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Problem Statement

You are given an m x n integers grid, and three integers row, col, and color. Each cell in the grid has a color value represented by an integer.

Two cells are adjacent if they share a side. Cells with the same color and connected through adjacent cells form a connected component.

Color the border of the connected component that includes the cell at grid[row][col] with the new color provided. The border of a connected component consists of cells that are either adjacent to a cell with a different color or lie on the boundary of the grid.

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