Why run error? in the given problem

#1

#include
using namespace std;
int main() {
long n;
cin>>n;
long a[n];
for(int i=0;i<n;i++){
cin>>a[i];
}
long m;cin>>m;
int j;
for(j=0;j<n;j++){
if(m==a[j]){
cout<<j;
break;
}
}
if(j==n){
return -1;
}

return 0;

}

#2

It should be cout<<-1 not return-1
Return -1 means abnormal ending

#3

@rounaqkhandelwal24
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#4

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