Problem 1055 --搜索-草地DFS

1055: 搜索-草地DFS

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 66  Solved: 31
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Description

Input

Output

至少需要多少人

Sample Input

5 6
.#....
..#...
..#..#
...##.
.#....

Sample Output

5

Source

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