제출 #1027556

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1027556		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	88 ms	5144 KiB

sure

#include <bits/stdc++.h>
using namespace std;

#define ld long double

const int N = 1e5+5;

int n;
ld a[N], b[N], sufB[N];

signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);
  cout << fixed << setprecision(4);

  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i] >> b[i];
  }
  sort(a, a+n);
  sort(b, b+n);

  sufB[n] = 0;
  for (int i = n-1; i >= 0; i--) {
    sufB[i] = sufB[i+1] + b[i];
  }

  ld ans = 0;
  ld sumA = 0;
  for (int i = n-1; i >= 0; i--) {
    sumA += a[i];
    
    int l = 0;
    int r = n-1;
    while (l < r) {
      int mid = (l+r) >> 1;

      if (sufB[mid] >= sumA) l = mid+1;
      else r = mid;
    }

    ans = max(ans, min(sumA, sufB[l]) - (n-i) - (n-l));
    if (l-1 >= 0) ans = max(ans, min(sumA, sufB[l-1]) - (n-i) - (n-l+1));
    if (l-2 >= 0) ans = max(ans, min(sumA, sufB[l-2]) - (n-i) - (n-l+2));
  }

  cout << max((ld)0, ans) << "\n";
}

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