LeetCode:Wildcard Matching

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

 

DP:

dp[i][j] = 1 表示s[1~i] 和 p[1~j] match。

则：

if p[j] == '*' && (dp[i][j-1] || dp[i-1][j]) 

dp[i][j] =  1 

else p[j] = ? || p[j] == s[i]

dp[i][j] = dp[i-1][j-1];

else dp[i][j] = false;

 

bool isMatch(const char *s, const char *p) {
        const char *position = NULL;
        const char *sp = NULL;

        while (*s) {
            if (*s == *p || *p == '?') {
                s++; 
                p++;
            }
            else if (*p == '*') {
                position = p;
                p++;
                sp = s;
            }
            else if (position) {
                p = position + 1;
                s = ++sp;
            }
            else return false;
        }

        while (*p == '*') p++;

        return *p == '\0'; 
    }