mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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187 lines
16 KiB
JSON
187 lines
16 KiB
JSON
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"questionId": "2428",
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"title": "Equal Row and Column Pairs",
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"content": "<p>Given a <strong>0-indexed</strong> <code>n x n</code> integer matrix <code>grid</code>, <em>return the number of pairs </em><code>(R<sub>i</sub>, C<sub>j</sub>)</code><em> such that row </em><code>R<sub>i</sub></code><em> and column </em><code>C<sub>j</sub></code><em> are equal</em>.</p>\n\n<p>A row and column pair is considered equal if they contain the same elements in the same order (i.e. an equal array).</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/06/01/ex1.jpg\" style=\"width: 150px; height: 153px;\" />\n<pre>\n<strong>Input:</strong> grid = [[3,2,1],[1,7,6],[2,7,7]]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> There is 1 equal row and column pair:\n- (Row 2, Column 1): [2,7,7]\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/06/01/ex2.jpg\" style=\"width: 200px; height: 209px;\" />\n<pre>\n<strong>Input:</strong> grid = [[3,1,2,2],[1,4,4,5],[2,4,2,2],[2,4,2,2]]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> There are 3 equal row and column pairs:\n- (Row 0, Column 0): [3,1,2,2]\n- (Row 2, Column 2): [2,4,2,2]\n- (Row 3, Column 2): [2,4,2,2]\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == grid.length == grid[i].length</code></li>\n\t<li><code>1 <= n <= 200</code></li>\n\t<li><code>1 <= grid[i][j] <= 10<sup>5</sup></code></li>\n</ul>\n",
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"difficulty": "Medium",
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"categoryTitle": "Algorithms",
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"code": "class Solution(object):\n def equalPairs(self, grid):\n \"\"\"\n :type grid: List[List[int]]\n :rtype: int\n \"\"\"\n ",
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"code": "# @param {Integer[][]} grid\n# @return {Integer}\ndef equal_pairs(grid)\n \nend",
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"code": "impl Solution {\n pub fn equal_pairs(grid: Vec<Vec<i32>>) -> i32 {\n \n }\n}",
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"code": "(define/contract (equal-pairs grid)\n (-> (listof (listof exact-integer?)) exact-integer?)\n\n )",
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"code": "-spec equal_pairs(Grid :: [[integer()]]) -> integer().\nequal_pairs(Grid) ->\n .",
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"code": "defmodule Solution do\n @spec equal_pairs(grid :: [[integer]]) :: integer\n def equal_pairs(grid) do\n\n end\nend",
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"hints": [
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"We can use nested loops to compare every row against every column.",
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"Another loop is necessary to compare the row and column element by element.",
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"It is also possible to hash the arrays and compare the hashed values instead."
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],
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