Smallest Multiple Problem & Solution
2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
See the smallest multiple problem on Project Euler.
C++ Solution
#pragma GCC optimize("Ofast")
#include <iostream>
using namespace std;
static const int _=[](){ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);return 0;}();
int main() {
// You can do this problem by hand; there is no point in writing an algorithm.
cout << 19 * 17 * 16 * 13 * 11 * 9 * 7 * 5 << endl;
}