I have been trying this problem (https://www.codechef.com/SEPT18B/problems/MAGICHF) and when I run it, it displays the correct output but when I put it on code chef it shows wrong answer. Why is that
the code is `#include<stdio.h>
int main(){
int x,n,s,i,j,t,a,b,k;
scanf("%d\n",&t);
for(i=1;i<=t;i++)
{
scanf("%d%d%d",&n,&x,&s);
//b=k;
for(j=2;j<=s+1;j++)
{
scanf("%d%d",&a,&b);
a=a-b;
b=a+b;
a=b-a;
}
printf("%d",b);
}
}`
ive done it in C