Help me in solving SMOL problem

help
,
1

My issue

why am i facing runtime eroor in this code

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
	int t,n,k;
	cin>>t;
	for(int i=0;i<t;i++){
	    cin>>n>>k;
	    cout<<n%k<<endl;
	}

}

Learning course: Level up from 1* to 2*
Problem Link: Smallest Possible Whole Number Practice Problem in Level up from 1* to 2* - CodeChef

2

@anishwagle1234
u have to make separate case for k==0;