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| // @Title: 被围绕的区域 (Surrounded Regions)
// @Author: 15816537946@163.com
// @Date: 2019-11-19 18:22:17
// @Runtime: 32 ms
// @Memory: 5.8 MB
func solve(board [][]byte) {
if board == nil {
return
}
var dfs func( int, int)
dfs = func(i,j int ) {
// if i < 0 || j< 0 || i> len(board)-1 || j > len(board[0])-1 || board[i][j] == 'X' || board[i][j] == '#' {
if i < 0 || j< 0 || i>= len(board) || j >= len(board[0]) || board[i][j] == 'X' || board[i][j] == '#' {
return
}
board[i][j] = '#'
dfs(i+1,j)
dfs(i-1,j)
dfs(i,j-1)
dfs(i,j+1)
}
for i := range board {
for j := range board[0] {
if (i == 0 || j == 0 || i== len(board)-1 || j == len(board[0])-1) && board[i][j] == 'O' {
dfs(i,j)
}
}
}
// 替换&&填充元素
for i := range board {
for j := range board[0] {
if board[i][j] == '#' {
board[i][j] = 'O'
continue
}
if board[i][j] == 'O' {
board[i][j] = 'X'
}
}
}
}
|