oj.uz

답안 #924424

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
924424 2024-02-09T03:35:05 Z NK_ Sure Bet (CEOI17_sure) C++17
0 / 100
 1 ms 348 KB 
// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'
#define pb push_back
#define sz(x) int(x.size())

using db = double;
using ll = long long;
template<class T> using V = vector<T>;
using vl = V<ll>;

const ll MUL = ll(1e4);

int main() {
	cin.tie(0)->sync_with_stdio(0);

	int N; cin >> N;

	vl A(N), B(N); for(int i = 0; i < N; i++) {
		double x, y; cin >> x >> y;
		A[i] = MUL * x, B[i] = MUL * y;
	}

	sort(rbegin(A), rend(A)); sort(rbegin(B), rend(B));

	for(int i = 1; i < N; i++) A[i] += A[i - 1];
	for(int i = 1; i < N; i++) B[i] += B[i - 1];

	// for(auto& x : A) cout << x << " ";
	// cout << endl;

	// for(auto& x : B) cout << x << " ";
	// cout << endl;

	ll ans = 0;
	for(int x = 2; x <= 2 * N; x++) {
		// cout << x << " ===> " << endl;
		// take x odds	
		auto F = [&](int i) {
			ll res = min(A[i - 1] - x * MUL, B[x - 1 - i] - x * MUL);
			// cout << i << " => " << A[i - 1] - x * MUL << " " << B[x - 1 - i] - x * MUL << " => " << res << endl;
			ans = max(ans, res); return res;
		};

		// int lo = 1, hi = x - 1;
		// while(lo < hi) {
		// 	int mid = (lo + hi) / 2;
		// 	if (F(mid) >= F(mid + 1)) hi = mid - 1;
		// 	else lo = mid + 1;
		// }
		// F(lo);

		for(int y = 1; y < x; y++) F(y);

		// maximize min_{1 <= i <= x}(A[i - 1] - x, B[x - i] - x)
	} 

	printf("%.4lf", ans / db(MUL));

	exit(0-0);
}

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Incorrect 0 ms 348 KB Output isn't correct
7 Halted 0 ms 0 KB -