Latest Time You Can Obtain After Replacing Characters.cpp

class Solution {
public:
    string findLatestTime(string s) {
        if(s[0]=='?' && s[1]=='?' && s[3]=='?'  && s[4]=='?') return "11:59";
        if(s[0]=='?'){
            if( s[1]=='0' || s[1]=='?' || s[1]=='1')
            s[0]='1';
            else s[0]='0';
        }
        if(s[1]=='?' && s[0]=='1' ) s[1]='1';
        if(s[1]=='?' && s[0]=='0')s[1]='9';
        if(s[3]=='?') s[3]='5';
        if(s[4]=='?') s[4]='9';
       
        return s;
            
    }
};