lc10, *可以匹配0个或者多个前一个字符
1 class Solution(object): 2 def isMatch(self, s, p): 3 """ 4 :type s: str 5 :type p: str 6 :rtype: bool 7 """ 8 m=len(s)+1 9 n=len(p)+1 10 11 dp=[[False for j in range(n)] for i in range(m)] 12 dp[0][0]=True 13 14 for j in range(1,n): 15 if(j>=2 and p[j-1]=="*" and dp[0][j-2]==True ): 16 dp[0][j]=True 17 18 for i in range(1,m): 19 for j in range(1,n): 20 if(s[i-1]==p[j-1] or p[j-1]=="."): 21 dp[i][j]=dp[i-1][j-1] 22 elif p[j-1]=="*": 23 if(s[i-1]!=p[j-2] and p[j-2]!="."): 24 dp[i][j]=dp[i][j-2] 25 else: 26 dp[i][j]=dp[i][j-2] or dp[i][j-1] or dp[i-1][j] 27 28 return dp[-1][-1]
lc44 *可以匹配任意字符串
1 class Solution(object): 2 def isMatch(self, s, p): 3 """ 4 :type s: str 5 :type p: str 6 :rtype: bool 7 """ 8 m=len(s)+1 9 n=len(p)+1 10 11 dp=[[False for j in range(n)] for i in range(m)] 12 dp[0][0]=True 13 14 for j in range(1,n): 15 if (p[j-1]=='*' and dp[0][j-1]==True): 16 dp[0][j]=True 17 18 for i in range(1,m): 19 for j in range(1,n): 20 if(s[i-1]==p[j-1] or p[j-1]=='?'): 21 dp[i][j]=dp[i-1][j-1] 22 elif p[j-1]=="*": 23 # *表示空字符时； *表示任意字符， 24 dp[i][j]=dp[i][j-1] or dp[i-1][j] 25 26 return dp[-1][-1]