Sunday, March 8, 2015

44 Wildcard Matching

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
class Solution {
public:
    bool isMatch(const char *s, const char *p) {
        const char * star=NULL;
        const char * star_s = s;
        while(*s)
        {
            if (*s==*p || *p=='?')
            {
                s++;
                p++;
                continue;
            }
            else if (*p=='*')
            {
                star = p;
                star_s = s;
                p++;
                continue;
            }
            else if (star)
            {
                s=++star_s;
                p=star+1;
            }
            else
                return false;
        }
        while(*p=='*')
            p++;
        return !*p;
        
    }
};

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