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| // @Title: 单词搜索 (Word Search)
// @Author: 15816537946@163.com
// @Date: 2020-12-06 12:49:38
// @Runtime: 4 ms
// @Memory: 3.2 MB
func exist(board [][]byte, word string) bool {
if word == "" {
return false
}
m := len(board)
if m == 0 {
return false
}
n := len(board[0])
if n == 0 {
return false
}
var bfs func(int, int, int) bool
bfs = func(r, c, index int) bool {
if index == len(word) {
return true
}
if r < 0 || r >= m || c < 0 || c >= n || word[index] != board[r][c] {
return false
}
temp := board[r][c]
board[r][c] = 0
if bfs(r+1, c, index+1) || bfs(r, c+1, index+1) || bfs(r-1, c, index+1) || bfs(r, c-1, index+1) {
return true
}
board[r][c] = temp
return false
}
for i := range board {
for j := range board[0] {
if bfs(i, j, 0) {
return true
}
}
}
return false
}
|