OJ Board

Hi guys,
I went through almost all tricky testcases on this forum.. still WA.. plz help

#include<iostream>
#include<string>
#include<algorithm>
#include<cstdio>
using namespace std;

string conv(int x,int y,string s){
int sz=s.size(),i,val,rem;
string ans="";
char c;
long long int num=0;

for(i=0 ...