mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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156 lines
14 KiB
JSON
156 lines
14 KiB
JSON
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"questionId": "1239",
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"questionFrontendId": "1139",
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"boundTopicId": null,
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"title": "Largest 1-Bordered Square",
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"titleSlug": "largest-1-bordered-square",
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"content": "<p>Given a 2D <code>grid</code> of <code>0</code>s and <code>1</code>s, return the number of elements in the largest <strong>square</strong> subgrid that has all <code>1</code>s on its <strong>border</strong>, or <code>0</code> if such a subgrid doesn't exist in the <code>grid</code>.</p>\r\n\r\n<p> </p>\r\n<p><strong class=\"example\">Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> grid = [[1,1,1],[1,0,1],[1,1,1]]\r\n<strong>Output:</strong> 9\r\n</pre>\r\n\r\n<p><strong class=\"example\">Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> grid = [[1,1,0,0]]\r\n<strong>Output:</strong> 1\r\n</pre>\r\n\r\n<p> </p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 <= grid.length <= 100</code></li>\r\n\t<li><code>1 <= grid[0].length <= 100</code></li>\r\n\t<li><code>grid[i][j]</code> is <code>0</code> or <code>1</code></li>\r\n</ul>",
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"difficulty": "Medium",
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"exampleTestcases": "[[1,1,1],[1,0,1],[1,1,1]]\n[[1,1,0,0]]",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n int largest1BorderedSquare(vector<vector<int>>& grid) {\n \n }\n};",
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"code": "class Solution(object):\n def largest1BorderedSquare(self, grid):\n \"\"\"\n :type grid: List[List[int]]\n :rtype: int\n \"\"\"\n ",
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"code": "class Solution:\n def largest1BorderedSquare(self, grid: List[List[int]]) -> int:\n ",
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"code": "class Solution {\n\n /**\n * @param Integer[][] $grid\n * @return Integer\n */\n function largest1BorderedSquare($grid) {\n \n }\n}",
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"code": "class Solution {\n func largest1BorderedSquare(_ grid: [[Int]]) -> Int {\n \n }\n}",
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"lang": "Kotlin",
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"code": "class Solution {\n fun largest1BorderedSquare(grid: Array<IntArray>): Int {\n \n }\n}",
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"langSlug": "ruby",
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"code": "# @param {Integer[][]} grid\n# @return {Integer}\ndef largest1_bordered_square(grid)\n \nend",
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"langSlug": "scala",
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"code": "object Solution {\n def largest1BorderedSquare(grid: Array[Array[Int]]): Int = {\n \n }\n}",
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn largest1_bordered_square(grid: Vec<Vec<i32>>) -> i32 {\n \n }\n}",
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"__typename": "CodeSnippetNode"
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}
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"hints": [
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"For each square, know how many ones are up, left, down, and right of this square. You can find it in O(N^2) using dynamic programming.",
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"Now for each square ( O(N^3) ), we can evaluate whether that square is 1-bordered in O(1)."
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],
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"sampleTestCase": "[[1,1,1],[1,0,1],[1,1,1]]",
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