面试题32：字符串的通配符匹配

Implement wildcard pattern matching with support for'?'and'*'.

'?' Matches any single character.
'*' Matches any sequence of characters (including the empty sequence).

The matching should cover the entire input string (not partial).

The function prototype should be:
bool isMatch(const char *s, const char *p)

Some examples:
isMatch("aa","a") → false
isMatch("aa","aa") → true
isMatch("aaa","aa") → false
isMatch("aa", "*") → true
isMatch("aa", "a*") → true
isMatch("ab", "?*") → true
isMatch("aab", "c*a*b") → false
 1 class Solution {
 2 public:
 3     bool isMatch(const char *s, const char *p) {
 4         int i = 0, j = 0;
 5         int pstar = -1;
 6         int sstar = -1;
 7         while (s[i] != '\0') {
 8             if (p[j] == '?' || s[i] == p[j]) {
 9                 i++;
10                 j++;
11             } else if (p[j] == '*') {
12                 pstar = j;
13                 sstar = i;
14                 j++;
15             } else {
16                 if (pstar != -1) {
17                     j = pstar + 1;
18                     sstar++;
19                     i = sstar;
20                 } else {
21                     return false;
22                 }
23             }
24         }
25 
26         while (p[j] == '*') {
27             j++;
28         }
29         return p[j] == '\0';
30 
31     }
32 };

 

posted @ 2017-05-27 11:06  wxquare  阅读(339)  评论(0)  编辑  收藏  举报