Word Search @ LeetCode (Python)
kitt
posted @ 2014年4月09日 11:59
in LeetCode
, 4460 阅读
使用DFS, 不要再开一个新的棋盘或其他很大的变量来记录状态，不然容易超时。
Use DFS. Don't make a new board or other large variables to record state, or it's easy to TLE.
class Solution:
# @param {character[][]} board
# @param {string} word
# @return {boolean}
def exist(self, board, word):
self.b, self.w, self.m, self.n, self.wLen = board, word, len(board), len(board[0]), len(word)
for i in xrange(self.m):
for j in xrange(self.n):
if self.isFound(0, i, j):
return True
return False
def isFound(self, k, x, y):
if x < 0 or y < 0 or x >= self.m or y >= self.n or self.b[x][y] == '.' or self.b[x][y] != self.w[k]:
return False
if k == self.wLen - 1:
return True
tmp, self.b[x][y] = self.b[x][y], '.'
if self.isFound(k + 1, x - 1, y) or self.isFound(k + 1, x + 1, y) or \
self.isFound(k + 1, x, y - 1) or self.isFound(k + 1, x, y + 1):
return True
self.b[x][y] = tmp
return False
2014年4月24日 02:31
would you please give the time and space complexity for this problem?
Thank you so much!
2014年7月08日 13:12
替换成#的方法好巧妙！这样就不用数组记录visited了~赞
2014年9月02日 00:43
string类不应该是immutable么
为什么下一行能通过？
ch, board[r][c] = board[r][c], '#'
2015年7月31日 21:55
@zyx: 他这个过不了
2015年8月01日 14:21
已更新 @dbs:
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