usaco-practice/cses/Weird Algorithm/index.cpp

#include <iostream>
using namespace std;

int main() {
  long long i;
  cin >> i;
  cout << i << " ";

  while (i != 1) {
    if (i % 2 == 0) {
      i = i / 2;
      cout << i << " ";
    } else {
      i = i * 3 + 1;
      cout << i << " ";
    }
  }
}