Help me in solving FLIPCARDS problem

help
,
1

My issue

what is problem my logic?

My code

#include <stdio.h>

int main(void) {int t;
	// your code goes here
    scanf("%d",&t);
    while(t--){int n,x;
        scanf("%d%d",&n,&x);
        if(n==x){
        printf("%d\n",n-x);}
        else
        printf("%d\n",x);
    }
}

Learning course: 500 to 1000 difficulty problems
Problem Link: Flip the cards Practice Problem in - CodeChef