1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
| // @Title: 岛屿的最大面积 (Max Area of Island)
// @Author: 15816537946@163.com
// @Date: 2019-11-19 13:48:13
// @Runtime: 12 ms
// @Memory: 4.9 MB
func maxAreaOfIsland(grid [][]int) int {
var maxArea int
for i := range grid {
for j := range grid[0] {
maxArea = max(maxArea, dfs(grid,i,j))
}
}
return maxArea
}
func dfs(grid [][]int, i,j int) int {
if grid[i][j] == 0 {
return 0
}
// 更新状态
grid[i][j] = 0
area := 1
if i != 0 {
area += dfs(grid, i-1,j)
}
if j != 0 {
area += dfs(grid, i,j-1)
}
if i != len(grid)-1 {
area+= dfs(grid,i+1,j)
}
if j != len(grid[0])-1 {
area += dfs(grid,i,j+1)
}
return area
}
func max(a,b int) int {
if a > b {
return a
}
return b
}
|