BOJ 15780 - 멀티탭 충분하니? [C++]

문제

링크

풀이

#include <iostream>
#include <vector>
using namespace std;
 
void solve(void) {
  int n, k; cin >> n >> k;
  vector<int> a(k);
  for (int i=0; i<k; i++) cin >> a[i];
 
  int sum = 0;
  for (int i=0; i<k; i++) {
    sum += (a[i] + 1) / 2;
  }
  cout << (sum >= n ? "YES" : "NO");
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}