BOJ 30490 - Battle Bots [C++]

문제

링크

풀이

#include <iostream>
using namespace std;
 
int solve(void) {
  long long n; cin >> n;
 
  if (n == 1 || n == 2) return n;
  for (int i=1; i<=64; i++) {
    if (n <= (1LL << i-1)) return i;
  }
  return 0;
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  cout << solve();
  return 0;
}