# Doubt in RUNCOMPARE problem

Learning course: Arrays using C
Problem Link: CodeChef: Practical coding for everyone

### Feedback

For the below written code I am getting the desired output for the first case but for the remaining cases, I am getting random outputs, please help me understand what’s going wrong here, I am not able to find the particular reason for such behaviour of my code.

code:

include <stdio.h>

int main(void) {
int t,n,c;

``````scanf("%d",&t);

for(int i=0;i<t;i++){

c=0;

scanf("%d",&n);

int a[n],b[n];

for(int j=0;j<n;j++) scanf("%d",&a[j]);

for(int j=0;j<=n;j++) scanf("%d",&b[j]);

for(int k=0;k<n;k++){

if(a[k]<=2*b[k] && b[k]<=2*a[k]){

c++;
}

}

printf("%d\n",c);
}
return 0;
``````

}

In scanning b loop u have run loop till <=n which would be <n.

1 Like

using namespace std;

int main() {
int T;
cin >> T;

``````while (T--) {
int N;
cin >> N;

vector<int> aliceDistances(N);
vector<int> bobDistances(N);

for (int i = 0; i < N; i++) {
cin >> aliceDistances[i];
}

for (int i = 0; i < N; i++) {
cin >> bobDistances[i];
}

int happyDays = 0;

for (int i = 0; i < N; i++) {
if (aliceDistances[i] <= bobDistances[i] * 2 && bobDistances[i] <= aliceDistances[i] * 2) {
happyDays++;
}
}

cout << happyDays << endl;
}

return 0;
``````

}