Comments (2)
triangleCZH
commented on August 15, 2024
@lei-hsia 在主函数的if ()不是唯一进入递归的方法，辅函数里面也有dfs(grid, x, y)， 那么这个辅函数调用自己之前也需要检测 == 0的case。如果不这么做的话，会有以下问题：
假设[[1,1,1,1,1]]，我们从dfs(grid, 0,0)开始，他会进入递归去做dfs(grid, 0, 1)，dfs(grid,0,1)反过来又会去做dfs(grid,0,0)，这里只有在辅函数内部检测过 grid[0][0] == 0 才能停下，否则两个连续的island会无限相互call。辅函数中把grid[r][c] 先设置成0就是为了标记已检测的岛屿，配合if grid[][] == 0防止被二次检测
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lei-hsia
commented on August 15, 2024
赞👍. 懂了，其实最重要的地方就是 dfs中也会调用dfs
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