OJ Board

Anyone please tell me why i am getting wrong !
my code pass all complex case i found here (like 1(2+3)9 ).. but still got wrong !

#include<bits/stdc++.h>
using namespace std;
int isInt(char b)
{
if(b>47 && b<58)
return 1;
else 0;
};
int main ()
{
// freopen("in.txt","r",stdin);
//freopen("out ...