Submission #732281

#	Time	Username	Problem	Language	Result	Execution time	Memory
732281		tvladm2009	Sure Bet (CEOI17_sure)	C++17	100 / 100	125 ms	8336 KiB

sure

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = (int) 2e5 + 7;
const ld INF = (ld) 1e9;
ld a[N], b[N];

ld f(int type1, int total) {
  return min(a[type1], b[total - type1]) - total;
}

signed main() {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i] >> b[i];
  }
  sort(a + 1, a + n + 1);
  reverse(a + 1, a + n + 1);
  sort(b + 1, b + n + 1);
  reverse(b + 1, b + n + 1);
  for (int i = 1; i <= 2 * n; i++) {
    a[i] += a[i - 1];
  }
  for (int i = 1; i <= 2 * n; i++) {
    b[i] += b[i - 1];
  }
  ld ret = 0;
  for (int i = 1; i <= 2 * n; i++) {
    int low = 0, high = min(n, i), sol = 0;
    while (low <= high) {
      int mid = (low + high) / 2;
      if (f(mid, i) >= f(mid - 1, i)) {
        sol = mid;
        low = mid + 1;
      } else {
        high = mid - 1;
      }
    }
    ret = max(ret, f(sol, i));
  }
  cout << setprecision(4) << fixed << ret;
  return 0;
}

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