BOJ 34845 - 강의평 [C++]

문제

링크

풀이

#include <iostream>
#include <vector>
using namespace std;
 
void solve(void) {
  int n, x; cin >> n >> x;
  vector<int> a(n);
 
  int sum = 0;
  for (int i=0; i<n; i++) {
    cin >> a[i];
    sum += a[i];
  }
 
  while (sum < n * x) {
    sum += 100;
    n++;
  }
  cout << n - (int)a.size();
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}