leetcode-problemset/leetcode/originData/lucky-numbers-in-a-matrix.json

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            "title": "Lucky Numbers in a Matrix",
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            "content": "<p>Given an <code>m x n</code> matrix of <strong>distinct </strong>numbers, return <em>all <strong>lucky numbers</strong> in the matrix in <strong>any </strong>order</em>.</p>\n\n<p>A <strong>lucky number</strong> is an element of the matrix such that it is the minimum element in its row and maximum in its column.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> matrix = [[3,7,8],[9,11,13],[15,16,17]]\n<strong>Output:</strong> [15]\n<strong>Explanation:</strong> 15 is the only lucky number since it is the minimum in its row and the maximum in its column.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> matrix = [[1,10,4,2],[9,3,8,7],[15,16,17,12]]\n<strong>Output:</strong> [12]\n<strong>Explanation:</strong> 12 is the only lucky number since it is the minimum in its row and the maximum in its column.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> matrix = [[7,8],[1,2]]\n<strong>Output:</strong> [7]\n<strong>Explanation:</strong> 7 is the only lucky number since it is the minimum in its row and the maximum in its column.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>m == mat.length</code></li>\n\t<li><code>n == mat[i].length</code></li>\n\t<li><code>1 &lt;= n, m &lt;= 50</code></li>\n\t<li><code>1 &lt;= matrix[i][j] &lt;= 10<sup>5</sup></code>.</li>\n\t<li>All elements in the matrix are distinct.</li>\n</ul>\n",
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                    "lang": "C++",
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                    "code": "class Solution {\npublic:\n    vector<int> luckyNumbers (vector<vector<int>>& matrix) {\n        \n    }\n};",
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                    "code": "class Solution {\n    public List<Integer> luckyNumbers (int[][] matrix) {\n        \n    }\n}",
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                    "lang": "Python",
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                    "code": "class Solution(object):\n    def luckyNumbers (self, matrix):\n        \"\"\"\n        :type matrix: List[List[int]]\n        :rtype: List[int]\n        \"\"\"\n        ",
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                    "lang": "Python3",
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                    "code": "class Solution:\n    def luckyNumbers (self, matrix: List[List[int]]) -> List[int]:\n        ",
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                    "lang": "C",
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                    "code": "\n\n/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nint* luckyNumbers (int** matrix, int matrixSize, int* matrixColSize, int* returnSize){\n\n}",
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                    "lang": "C#",
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                    "code": "public class Solution {\n    public IList<int> LuckyNumbers (int[][] matrix) {\n        \n    }\n}",
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                    "lang": "JavaScript",
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                    "code": "/**\n * @param {number[][]} matrix\n * @return {number[]}\n */\nvar luckyNumbers  = function(matrix) {\n    \n};",
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                    "lang": "Ruby",
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                    "code": "# @param {Integer[][]} matrix\n# @return {Integer[]}\ndef lucky_numbers (matrix)\n    \nend",
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                    "lang": "Swift",
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                    "code": "class Solution {\n    func luckyNumbers (_ matrix: [[Int]]) -> [Int] {\n        \n    }\n}",
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                    "lang": "Go",
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                    "code": "func luckyNumbers (matrix [][]int) []int {\n    \n}",
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                    "lang": "Scala",
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                    "code": "object Solution {\n    def luckyNumbers (matrix: Array[Array[Int]]): List[Int] = {\n        \n    }\n}",
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                    "lang": "Kotlin",
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                    "code": "class Solution {\n    fun luckyNumbers (matrix: Array<IntArray>): List<Int> {\n        \n    }\n}",
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                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "impl Solution {\n    pub fn lucky_numbers (matrix: Vec<Vec<i32>>) -> Vec<i32> {\n        \n    }\n}",
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                    "code": "class Solution {\n\n    /**\n     * @param Integer[][] $matrix\n     * @return Integer[]\n     */\n    function luckyNumbers ($matrix) {\n        \n    }\n}",
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                    "code": "(define/contract (lucky-numbers  matrix)\n  (-> (listof (listof exact-integer?)) (listof exact-integer?))\n\n  )",
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            "hints": [
                "Find out and save the minimum of each row and maximum of each column in two lists.",
                "Then scan through the whole matrix to identify the elements that satisfy the criteria."
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