Submission #841816

#	Time	Username	Problem	Language	Result	Execution time	Memory
841816		WLZ	Sure Bet (CEOI17_sure)	C++17	100 / 100	70 ms	2244 KiB

sure

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<double> v_a, v_b;
  for (int i = 0; i < n; i++) {
    double a, b;
    cin >> a >> b;
    v_a.push_back(a);
    v_b.push_back(b);
  }
  sort(v_a.rbegin(), v_a.rend());
  sort(v_b.rbegin(), v_b.rend());
  double a = 0.0, b = 0.0, ans = 0.0;
  for (int x = 0, y = 0; x <= n; x++) {
    if (x > 0) a += v_a[x - 1] - 1, b -= 1.0;
    while (y < n && a - b > 1e-7) {
      ans = max(ans, min(a, b));
      b += v_b[y++] - 1, a -= 1.0;
    }
    ans = max(ans, min(a, b));
  }
  cout << fixed << setprecision(4) << ans << '\n';
  return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40