{ "data": { "question": { "questionId": "971", "questionFrontendId": "934", "categoryTitle": "Algorithms", "boundTopicId": 2244, "title": "Shortest Bridge", "titleSlug": "shortest-bridge", "content": "
You are given an n x n binary matrix grid where 1 represents land and 0 represents water.
An island is a 4-directionally connected group of 1's not connected to any other 1's. There are exactly two islands in grid.
You may change 0's to 1's to connect the two islands to form one island.
Return the smallest number of 0's you must flip to connect the two islands.
\n
Example 1:
\n\n\nInput: grid = [[0,1],[1,0]]\nOutput: 1\n\n\n
Example 2:
\n\n\nInput: grid = [[0,1,0],[0,0,0],[0,0,1]]\nOutput: 2\n\n\n
Example 3:
\n\n\nInput: grid = [[1,1,1,1,1],[1,0,0,0,1],[1,0,1,0,1],[1,0,0,0,1],[1,1,1,1,1]]\nOutput: 1\n\n\n
\n
Constraints:
\n\nn == grid.length == grid[i].length2 <= n <= 100grid[i][j] is either 0 or 1.grid.给你一个大小为 n x n 的二元矩阵 grid ,其中 1 表示陆地,0 表示水域。
岛 是由四面相连的 1 形成的一个最大组,即不会与非组内的任何其他 1 相连。grid 中 恰好存在两座岛 。
你可以将任意数量的 0 变为 1 ,以使两座岛连接起来,变成 一座岛 。
返回必须翻转的 0 的最小数目。
\n\n
示例 1:
\n\n\n输入:grid = [[0,1],[1,0]]\n输出:1\n\n\n
示例 2:
\n\n\n输入:grid = [[0,1,0],[0,0,0],[0,0,1]]\n输出:2\n\n\n
示例 3:
\n\n\n输入:grid = [[1,1,1,1,1],[1,0,0,0,1],[1,0,1,0,1],[1,0,0,0,1],[1,1,1,1,1]]\n输出:1\n\n\n
\n\n
提示:
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