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33 lines
1.9 KiB
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33 lines
1.9 KiB
HTML
<p>There is an <code>m x n</code> rectangular island that borders both the <strong>Pacific Ocean</strong> and <strong>Atlantic Ocean</strong>. The <strong>Pacific Ocean</strong> touches the island's left and top edges, and the <strong>Atlantic Ocean</strong> touches the island's right and bottom edges.</p>
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<p>The island is partitioned into a grid of square cells. You are given an <code>m x n</code> integer matrix <code>heights</code> where <code>heights[r][c]</code> represents the <strong>height above sea level</strong> of the cell at coordinate <code>(r, c)</code>.</p>
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<p>The island receives a lot of rain, and the rain water can flow to neighboring cells directly north, south, east, and west if the neighboring cell's height is <strong>less than or equal to</strong> the current cell's height. Water can flow from any cell adjacent to an ocean into the ocean.</p>
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<p>Return <em>a <strong>2D list</strong> of grid coordinates </em><code>result</code><em> where </em><code>result[i] = [r<sub>i</sub>, c<sub>i</sub>]</code><em> denotes that rain water can flow from cell </em><code>(r<sub>i</sub>, c<sub>i</sub>)</code><em> to <strong>both</strong> the Pacific and Atlantic oceans</em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/06/08/waterflow-grid.jpg" style="width: 573px; height: 573px;" />
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<pre>
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<strong>Input:</strong> heights = [[1,2,2,3,5],[3,2,3,4,4],[2,4,5,3,1],[6,7,1,4,5],[5,1,1,2,4]]
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<strong>Output:</strong> [[0,4],[1,3],[1,4],[2,2],[3,0],[3,1],[4,0]]
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> heights = [[2,1],[1,2]]
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<strong>Output:</strong> [[0,0],[0,1],[1,0],[1,1]]
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>m == heights.length</code></li>
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<li><code>n == heights[r].length</code></li>
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<li><code>1 <= m, n <= 200</code></li>
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<li><code>0 <= heights[r][c] <= 10<sup>5</sup></code></li>
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</ul>
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