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        "question": {
            "questionId": "3884",
            "questionFrontendId": "3567",
            "categoryTitle": "Algorithms",
            "boundTopicId": 3688600,
            "title": "Minimum Absolute Difference in Sliding Submatrix",
            "titleSlug": "minimum-absolute-difference-in-sliding-submatrix",
            "content": "<p>You are given an <code>m x n</code> integer matrix <code>grid</code> and an integer <code>k</code>.</p>\n\n<p>For every contiguous <code>k x k</code> <strong>submatrix</strong> of <code>grid</code>, compute the <strong>minimum absolute</strong> difference between any two <strong>distinct</strong> values within that <strong>submatrix</strong>.</p>\n\n<p>Return a 2D array <code>ans</code> of size <code>(m - k + 1) x (n - k + 1)</code>, where <code>ans[i][j]</code> is the minimum absolute difference in the submatrix whose top-left corner is <code>(i, j)</code> in <code>grid</code>.</p>\n\n<p><strong>Note</strong>: If all elements in the submatrix have the same value, the answer will be 0.</p>\nA submatrix <code>(x1, y1, x2, y2)</code> is a matrix that is formed by choosing all cells <code>matrix[x][y]</code> where <code>x1 &lt;= x &lt;= x2</code> and <code>y1 &lt;= y &lt;= y2</code>.\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">grid = [[1,8],[3,-2]], k = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">[[2]]</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>There is only one possible <code>k x k</code> submatrix: <code><span class=\"example-io\">[[1, 8], [3, -2]]</span></code><span class=\"example-io\">.</span></li>\n\t<li>Distinct values in the submatrix are<span class=\"example-io\"> <code>[1, 8, 3, -2]</code>.</span></li>\n\t<li>The minimum absolute difference in the submatrix is <code>|1 - 3| = 2</code>. Thus, the answer is <code>[[2]]</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">grid = [[3,-1]], k = 1</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">[[0,0]]</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>Both <code>k x k</code> submatrix has only one distinct element.</li>\n\t<li>Thus, the answer is <code>[[0, 0]]</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">grid = [[1,-2,3],[2,3,5]], k = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">[[1,2]]</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<ul>\n\t<li>There are two possible <code>k &times; k</code> submatrix:\n\n\t<ul>\n\t\t<li>Starting at <code>(0, 0)</code>: <code>[[1, -2], [2, 3]]</code>.\n\n\t\t<ul>\n\t\t\t<li>Distinct values in the submatrix are <code>[1, -2, 2, 3]</code>.</li>\n\t\t\t<li>The minimum absolute difference in the submatrix is <code>|1 - 2| = 1</code>.</li>\n\t\t</ul>\n\t\t</li>\n\t\t<li>Starting at <code>(0, 1)</code>: <code>[[-2, 3], [3, 5]]</code>.\n\t\t<ul>\n\t\t\t<li>Distinct values in the submatrix are <code>[-2, 3, 5]</code>.</li>\n\t\t\t<li>The minimum absolute difference in the submatrix is <code>|3 - 5| = 2</code>.</li>\n\t\t</ul>\n\t\t</li>\n\t</ul>\n\t</li>\n\t<li>Thus, the answer is <code>[[1, 2]]</code>.</li>\n</ul>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m == grid.length &lt;= 30</code></li>\n\t<li><code>1 &lt;= n == grid[i].length &lt;= 30</code></li>\n\t<li><code>-10<sup>5</sup> &lt;= grid[i][j] &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= k &lt;= min(m, n)</code></li>\n</ul>\n",
            "translatedTitle": "子矩阵的最小绝对差",
            "translatedContent": "<p>给你一个 <code>m x n</code> 的整数矩阵 <code>grid</code> 和一个整数 <code>k</code>。</p>\n\n<p>对于矩阵 <code>grid</code> 中的每个连续的 <code>k x k</code> <strong>子矩阵</strong>，计算其中任意两个&nbsp;<strong>不同</strong>值 之间的&nbsp;<strong>最小绝对差&nbsp;</strong>。</p>\n\n<p>返回一个大小为 <code>(m - k + 1) x (n - k + 1)</code> 的二维数组 <code>ans</code>，其中 <code>ans[i][j]</code> 表示以 <code>grid</code> 中坐标 <code>(i, j)</code> 为左上角的子矩阵的最小绝对差。</p>\n\n<p><strong>注意</strong>：如果子矩阵中的所有元素都相同，则答案为 0。</p>\n\n<p>子矩阵 <code>(x1, y1, x2, y2)</code> 是一个由选择矩阵中所有满足 <code>x1 &lt;= x &lt;= x2</code> 且 <code>y1 &lt;= y &lt;= y2</code> 的单元格 <code>matrix[x][y]</code> 组成的矩阵。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">grid = [[1,8],[3,-2]], k = 2</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">[[2]]</span></p>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>只有一个可能的 <code>k x k</code> 子矩阵：<code><span class=\"example-io\">[[1, 8], [3, -2]]</span></code>。</li>\n\t<li>子矩阵中的不同值为 <code>[1, 8, 3, -2]</code>。</li>\n\t<li>子矩阵中的最小绝对差为 <code>|1 - 3| = 2</code>。因此，答案为 <code>[[2]]</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">grid = [[3,-1]], k = 1</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">[[0,0]]</span></p>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>每个 <code>k x k</code> 子矩阵中只有一个不同的元素。</li>\n\t<li>因此，答案为 <code>[[0, 0]]</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">grid = [[1,-2,3],[2,3,5]], k = 2</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">[[1,2]]</span></p>\n\n<p><strong>解释：</strong></p>\n\n<ul>\n\t<li>有两个可能的 <code>k × k</code> 子矩阵：\n\n\t<ul>\n\t\t<li>以 <code>(0, 0)</code> 为起点的子矩阵：<code>[[1, -2], [2, 3]]</code>。\n\n\t\t<ul>\n\t\t\t<li>子矩阵中的不同值为 <code>[1, -2, 2, 3]</code>。</li>\n\t\t\t<li>子矩阵中的最小绝对差为 <code>|1 - 2| = 1</code>。</li>\n\t\t</ul>\n\t\t</li>\n\t\t<li>以 <code>(0, 1)</code> 为起点的子矩阵：<code>[[-2, 3], [3, 5]]</code>。\n\t\t<ul>\n\t\t\t<li>子矩阵中的不同值为 <code>[-2, 3, 5]</code>。</li>\n\t\t\t<li>子矩阵中的最小绝对差为 <code>|3 - 5| = 2</code>。</li>\n\t\t</ul>\n\t\t</li>\n\t</ul>\n\t</li>\n\t<li>因此，答案为 <code>[[1, 2]]</code>。</li>\n</ul>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m == grid.length &lt;= 30</code></li>\n\t<li><code>1 &lt;= n == grid[i].length &lt;= 30</code></li>\n\t<li><code>-10<sup>5</sup> &lt;= grid[i][j] &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= k &lt;= min(m, n)</code></li>\n</ul>\n",
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