wildcard_matching

class Solution {
public:
    bool isMatch(const string &s,const string &p, int i=0, int j=0) {
        int n=s.size(),m=p.size();
        string s_sub = (i<n)?s.substr(i):"",p_sub =(j<m)?p.substr(j):"";
        if(p_sub.empty()) return s_sub.empty();
        if(j<m and (p[j]=='?' or (i<n and p[j]==s[i] )))
                return isMatch(p,s,i+1,j+1);
        if (j<m and p[j] == '*')
                return (isMatch(s,p,i+1,j) || isMatch(s,p,i,j+1));
  return false;
    }
};