C :

#include<stdio.h>
int main()
{
  int n,i=1,a,b;
  scanf("%d",&n);
  while(i<=n)
  {  
	  i++;
	  scanf("%d%d",&a,&b);
     if(a==b)
		 printf("zi\n");
	 else
		 printf("cheng\n");
  }
	 return 0;
}

C++ :

#include<cstdio>
#include<iostream>
#include<cstring>
using namespace std;

int main()
{
    int i,j,k;
    int t,n,m;
    int s;
    scanf("%d",&t);
    while(t--)
    {
        s=0;
        for(i=1; i<=2; i++)
        {
            scanf("%d",&m);
            s^=m;
        }
        if(s)
            printf("cheng\n");
        else
            printf("zi\n");
    }
    return 0;
}