word_search
word_search.py 源码
from typing import List
# 单词搜索
class Solution:
def exist(self, board: List[List[str]], word: str) -> bool:
visited = [[False] * len(board[0]) for _ in range(len(board))]
for i in range(len(board)):
for j in range(len(board[i])):
if self.helper(board, word, visited, i, j, 0):
return True
return False
def helper(self, board, word, visited, i, j, k) -> bool:
if k == len(word):
return True
if i < 0 or j < 0 or i >= len(board) or j >= len(board[0]):
return False
if board[i][j] != word[k] or visited[i][j]:
return False
visited[i][j] = True
for x, y in [(0, 1), (1, 0), (0, -1), (-1, 0)]:
if self.helper(board, word, visited, i + x, j + y, k + 1):
return True
visited[i][j] = False
return False
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