Submission #1027318

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027318		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	70 ms	2012 KiB

sure

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

const int buff = 100000;
const long double dick = 1.0;

long long A[100008], B[100008];

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n; long double x; cin >> n;
	cout << fixed << setprecision(4);
	for (int i = 1; i <= n; ++i) {
		cin >> x; A[i] = round(x * buff);
		cin >> x; B[i] = round(x * buff);
	}
	sort(A + 1, A + n + 1, greater<long long>()); sort(B + 1, B + n + 1, greater<long long>());
	for (int i = 1; i <= n; ++i) A[i] += A[i - 1];
	for (int i = 1; i <= n; ++i) B[i] += B[i - 1];
	int j; long double ans = 0;
	for (int i = 1; i <= n && A[i] <= B[n]; ++i) { // A[i] <= B[j]
		j = lower_bound(B + 1, B + n + 1, A[i]) - B;
		// cout << (A[i] * dick) / buff - i - j << '\n';
		ans = max(ans, (A[i] * dick) / buff - i - j);
	}
	for (int i = 1; i <= n && B[i] <= A[n]; ++i) { // B[i] <= A[j]
		j = lower_bound(A + 1, A + n + 1, B[i]) - A;
		ans = max(ans, (B[i] * dick) / buff - i - j);
		// cout << (B[i] * dick) / buff - i - j << '\n';
	} 
	cout << ans;
}

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