Compile-Time Timer Reload

#include <iostream>
using namespace std;

constexpr unsigned int timerClockHz = 1'000'000;
// Define constexpr computeReload here
constexpr unsigned int computeReload(int clockHz, int intervalMs){
    return (clockHz * intervalMs + 500) / 1000; 
}
// Define constexpr RELOAD_TABLE here
constexpr unsigned int RELOAD_TABLE[3] = {
    computeReload(timerClockHz, 1),
    computeReload(timerClockHz, 10),
    computeReload(timerClockHz, 100)
};
int main() {
    int idx;
    cin >> idx;

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

Solving Approach