oj.uz

답안 #498444

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
498444 2021-12-25T08:07:16 Z Mukhitali Sure Bet (CEOI17_sure) C++17
0 / 100
 1 ms 204 KB 
//bit chass 1
#include <bits/stdc++.h>

#define x first
#define y second
#define el "\n"
#define ll long long
#define pb push_back
#define pll pair <ll, ll>
#define pii pair <int, int>
#define all(x) x.begin(), x.end()
#define lcm(x,y) x * y / __gcd(x, y)
#define ibase ios_base::sync_with_stdio(0), cin.tie(0)

using namespace std;

const int N = 3e5 + 5, inf = 1e9 + 7, M = 2e6, MM = 2e6 + 5, K = 300;
const ll MI = 2e18;
const double P = 3.14;

double a[N], b[N];
int n;

double get(int l) {
	double mx = -inf, s1 = 0, s2 = 0;
	if (l <= n) {
		int m = n - l + 1;
		for (int i = n; i >= n - l + 1; i--)
			s1 += a[i];
		for (int i = n; i >= n - l + 1; i--) {
			mx = max(mx, min(s1 - l, s2 - l));
			s1 -= a[m];
			m++;
			s2 += b[i];
		}
					mx = max(mx, min(s1 - l, s2 - l));
	}
	else {
		int m = 1;
		for (int i = 1; i <= n; i++)
			s1 += a[i];
		for (int i = n; i >= n - (l - n) + 1; i--) 
			s2 += b[i];
		for (int i = n - (l - n); i >= 1; i--) {
			mx = max(mx, min(s1 - l, s2 - l));
			s1 -= a[m];
			m++;
			s2 += b[i];
		}
					mx = max(mx, min(s1 - l, s2 - l));
	}
//	cout << l << ' ' << mx << el;
	return mx;
}

void solve() {
//	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) 
		cin >> a[i] >> b[i];
	sort(a + 1, a + n + 1);
	sort(b + 1, b + n + 1);
	int l = 0, r = 2 * n, m1 = l + 1, m2 = r - 1;
	while (r - l > 2) {
		m1 = l + (r - l) / 3;
		m2 = r - (r - l) / 3;
		if (get(m1) > get(m2)) 
			r = m2;
		else 
			l = m1;
	}
	cout << fixed << setprecision(4) << max(0.0, max(get(l), max(get(m1), max(get(m2), get(r)))));
	
}

int main() {
	ibase;
	int T = 1;
//	cin >> T;
	for (int i = 1; i <= T; i++) {
//		cout << "Case " << i << ": ";
		solve();
		cout << el;
	}
}
/*
4
4 2
4 1
2 5 2 3
*/

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Incorrect 1 ms 204 KB Output isn't correct
4 Halted 0 ms 0 KB -