Help me in solving MAX_DIFF problem

help
,
1

My issue

My code

#include <stdio.h>

int main(void) {
	
	int T;
	
	scanf("%d",&T);
	for(int i=0;i<T;i++){
	 int N,S;
	
	 scanf("%d %d",&N,&S); 
	 
	 if(N>=S)
	 printf("%d\n",S);
	 else
	 printf("%d\n",S-N);
	 
	}
	 return 0;
}

Problem Link: CodeChef: Practical coding for everyone

2

Replace S-N by 2*N - S

You need to find max difference between T1 and T2. You are correct in understanding that if sum is less than N then max difference occurs when T1=S and T2=0 but when S>N then max difference is when T1=N and T2=S-N (because neither T1 nor T2 can be greater than N)
Therefore, the difference will be T1 - T2 = N - (S-N) = 2N-S