Compile-Time Timer Reload

#include <iostream>
using namespace std;

// Define constexpr computeReload here
constexpr int computeReload(int intervalMs){
    return (1000000*intervalMs+500)/1000;
}
// Define constexpr RELOAD_TABLE here
constexpr int RELOAD_TABLE[]={computeReload(1),computeReload(10),computeReload(100)};
int main() {
    int idx;
    cin >> idx;

    // Print RELOAD_TABLE[idx]
    cout<<RELOAD_TABLE[idx];
    return 0;
}

Solving Approach