leetcode 200 島嶼數量

2022-06-24 03:45:11 字數 1070 閱讀 7631

給你乙個由 '1'(陸地)和 '0'(水)組成的的二維網格,請你計算網格中島嶼的數量。

島嶼總是被水包圍,並且每座島嶼只能由水平方向和/或豎直方向上相鄰的陸地連線形成。

此外,你可以假設該網格的四條邊均被水包圍。

示例 1:

輸入:grid = [

["1","1","1","1","0"],

["1","1","0","1","0"],

["1","1","0","0","0"],

["0","0","0","0","0"]

]輸出:1

示例 2:

輸入:grid = [

["1","1","0","0","0"],

["1","1","0","0","0"],

["0","0","1","0","0"],

["0","0","0","1","1"]

]輸出:3

m == grid.length

n == grid[i].length

1 <= m, n <= 300

grid[i][j] 的值為 '0' 或 '1'

class solution:

def numislands(self, grid: list[list[str]]) -> int:

def dfs(grid,r,c):

grid[r][c]=0

nr=len(grid)

nc=len(grid[0])

for x, y in [(r-1,c),(r+1,c),(r,c-1),(r,c+1)]:

if 0<=xdfs(grid,x,y)

nr=len(grid)

if nr==0:return 0

nc=len(grid[0])

res=0

for i in range(nr):

for j in range(nc):

if grid[i][j]=='1':

res+=1

dfs(grid,i,j)

return res

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