What is the error in the code

#include
using namespace std;

int main() {
// your code goes here
int t;
cin>>t;
while(t–){
int n,x,y;
cin>>n>>x>>y;
int arr[n]={0};
for(int i=0;i<n;i++){
cin>>arr[i];
}

    int count=0;
    //int house[100]={0};
    for(int i=0;i<n;i++){
        for(int j=arr[i];j<=100&&j<=arr[i]+x*y;j++){
            count++;
        }
        
        for(int j=arr[i];j>0&&j>=arr[i]-x*y;j--){
            count++;
        }
    }
    cout<<100-count<<endl;
}
return 0;

}
// ques link Contest Page | CodeChef

Use test case
1
2 10 10
30 40

Your Output: -102
Expected Output: 0

Hint: You are ignoring the fact that multiple cops can check the same house.

P.S: Format your code by wrapping your code inside ```