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51 lines
2.6 KiB
HTML
51 lines
2.6 KiB
HTML
<p>You are given an <code>m x n</code> integer matrix <code>points</code> (<strong>0-indexed</strong>). Starting with <code>0</code> points, you want to <strong>maximize</strong> the number of points you can get from the matrix.</p>
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<p>To gain points, you must pick one cell in <strong>each row</strong>. Picking the cell at coordinates <code>(r, c)</code> will <strong>add</strong> <code>points[r][c]</code> to your score.</p>
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<p>However, you will lose points if you pick a cell too far from the cell that you picked in the previous row. For every two adjacent rows <code>r</code> and <code>r + 1</code> (where <code>0 <= r < m - 1</code>), picking cells at coordinates <code>(r, c<sub>1</sub>)</code> and <code>(r + 1, c<sub>2</sub>)</code> will <strong>subtract</strong> <code>abs(c<sub>1</sub> - c<sub>2</sub>)</code> from your score.</p>
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<p>Return <em>the <strong>maximum</strong> number of points you can achieve</em>.</p>
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<p><code>abs(x)</code> is defined as:</p>
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<ul>
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<li><code>x</code> for <code>x >= 0</code>.</li>
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<li><code>-x</code> for <code>x < 0</code>.</li>
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</ul>
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<p> </p>
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<p><strong class="example">Example 1:</strong><strong> </strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/07/12/screenshot-2021-07-12-at-13-40-26-diagram-drawio-diagrams-net.png" style="width: 300px; height: 300px;" />
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<pre>
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<strong>Input:</strong> points = [[1,2,3],[1,5,1],[3,1,1]]
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<strong>Output:</strong> 9
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<strong>Explanation:</strong>
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The blue cells denote the optimal cells to pick, which have coordinates (0, 2), (1, 1), and (2, 0).
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You add 3 + 5 + 3 = 11 to your score.
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However, you must subtract abs(2 - 1) + abs(1 - 0) = 2 from your score.
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Your final score is 11 - 2 = 9.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/07/12/screenshot-2021-07-12-at-13-42-14-diagram-drawio-diagrams-net.png" style="width: 200px; height: 299px;" />
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<pre>
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<strong>Input:</strong> points = [[1,5],[2,3],[4,2]]
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<strong>Output:</strong> 11
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<strong>Explanation:</strong>
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The blue cells denote the optimal cells to pick, which have coordinates (0, 1), (1, 1), and (2, 0).
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You add 5 + 3 + 4 = 12 to your score.
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However, you must subtract abs(1 - 1) + abs(1 - 0) = 1 from your score.
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Your final score is 12 - 1 = 11.
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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 == points.length</code></li>
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<li><code>n == points[r].length</code></li>
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<li><code>1 <= m, n <= 10<sup>5</sup></code></li>
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<li><code>1 <= m * n <= 10<sup>5</sup></code></li>
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<li><code>0 <= points[r][c] <= 10<sup>5</sup></code></li>
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</ul>
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