mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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181 lines
18 KiB
JSON
181 lines
18 KiB
JSON
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"questionId": "3492",
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"title": "Count Submatrices With Equal Frequency of X and Y",
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"content": "<p>Given a 2D character matrix <code>grid</code>, where <code>grid[i][j]</code> is either <code>'X'</code>, <code>'Y'</code>, or <code>'.'</code>, return the number of <span data-keyword=\"submatrix\">submatrices</span> that contain:</p>\n\n<ul>\n\t<li><code>grid[0][0]</code></li>\n\t<li>an <strong>equal</strong> frequency of <code>'X'</code> and <code>'Y'</code>.</li>\n\t<li><strong>at least</strong> one <code>'X'</code>.</li>\n</ul>\n\n<p> </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 = [["X","Y","."],["Y",".","."]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2024/06/07/examplems.png\" style=\"padding: 10px; background: rgb(255, 255, 255); border-radius: 0.5rem; width: 175px; height: 350px;\" /></strong></p>\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 = [["X","X"],["X","Y"]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>No submatrix has an equal frequency of <code>'X'</code> and <code>'Y'</code>.</p>\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 = [[".","."],[".","."]]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">0</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>No submatrix has at least one <code>'X'</code>.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= grid.length, grid[i].length <= 1000</code></li>\n\t<li><code>grid[i][j]</code> is either <code>'X'</code>, <code>'Y'</code>, or <code>'.'</code>.</li>\n</ul>\n",
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"difficulty": "Medium",
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"categoryTitle": "Algorithms",
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"name": "Prefix Sum",
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"Replace <code>’X’</code> with 1, <code>’Y’</code> with -1 and <code>’.’</code> with 0.",
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"You need to find how many submatrices <code>grid[0..x][0..y]</code> have a sum of 0 and at least one <code>’X’</code>.",
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"Use prefix sum to calculate submatrices sum."
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