leetcode Question 123: Wildcard Matching

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

Analysis:

For each element in s
If *s==*p or *p == ? which means this is a match, then goes to next element s++ p++.
If p=='*', this is also a match, but one or many chars may be available, so let us save this *'s position and the matched s position.
If not match, then we check if there is a * previously showed up,
       if there is no *,  return false;
       if there is an *,  we set current p to the next element of *, and set current s to the next saved s position.

e.g.

abed
?b*d**

a=?, go on, b=b, go on,
e=*, save * position star=3, save s position ss = 3, p++
e!=d,  check if there was a *, yes, ss++, s=ss; p=star+1
d=d, go on, meet the end.
check the rest element in p, if all are *, true, else false;

Note that in char array, the last is NOT NULL, to check the end, use  "*p"  or "*p=='\0'".

Code(C++):

class Solution {
public:
    bool isMatch(const char *s, const char *p) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        
        const char* star=NULL;
        const char* ss=s; 
        while (*s){
            if ((*p=='?')||(*p==*s)){s++;p++;continue;}
            if (*p=='*'){star=p++; ss=s;continue;}
            if (star){ p = star+1; s=++ss;continue;}
            return false;
        }
        while (*p=='*'){p++;}
        return !*p;
    }
};

Code (Python):

class Solution:
    # @param s, an input string
    # @param p, a pattern string
    # @return a boolean
    def isMatch(self, s, p):
        s_cur = 0;
        p_cur= 0;
        match = 0;
        star = -1;
        while s_cur<len(s):
            if p_cur< len(p) and (s[s_cur]==p[p_cur] or p[p_cur]=='?'):
                s_cur = s_cur + 1
                p_cur = p_cur + 1
            elif p_cur<len(p) and p[p_cur]=='*':
                match = s_cur
                star = p_cur
                p_cur = p_cur+1
            elif (star!=-1):
                p_cur = star+1
                match = match+1
                s_cur = match
            else:
                return False
        while p_cur<len(p) and p[p_cur]=='*':
            p_cur = p_cur+1
            
        if p_cur==len(p):
            return True
        else:
            return False