PLEASE TELL ERROR IN THIS CODE, IT IS SHOWING RUN TIME ERROR

int main() { long long int n,k,q,a[n],i,m[q],t;

cin>>n>>k>>q;
for(i=0;i<n;i++){
    cin>>a[i];
}
for(i=0;i<q;i++){
    cin>>m[i]; 
}
for(i=0;i<k;i++){
    t=a[n-1];
    for(i=n-2;i>0;i--){
        a[i+1]=a[i];
    }
    a[0]=t;
}
for(i=0;i<q;i++){
    cout<<a[m[i]]<<" ";
}
return 0;

}