Compile-Time Timer Reload

#include <iostream>
using namespace std;

// Define constexpr computeReload here
constexpr int computeReload(int clockHz, int intervalMs){
    return (clockHz * intervalMs + 500) / 1000;
};

// Define constexpr RELOAD_TABLE here
constexpr int RELOAD_TABLE[] {1, 10, 100};

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

    // Print RELOAD_TABLE[idx]
    int timerClockHz = 1000000;

    cout << computeReload(timerClockHz, RELOAD_TABLE[idx]);

    return 0;
}

Solving Approach