Submission #545719

#	Time	Username	Problem	Language	Result	Execution time	Memory
545719		Sohsoh84	Sure Bet (CEOI17_sure)	C++17	100 / 100	96 ms	18496 KiB

sure

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)			(x).begin(),(x).end()
#define X			first
#define Y			second
#define sep			' '
#define endl			'\n'
#define debug(x)		cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e6 + 10;
const ll HMM = 1e4;

int n;
ll A[MAXN], B[MAXN], ans, ps[MAXN];

inline void f() {
	for (int i = 1; i <= n; i++)
		ps[i] = ps[i - 1] + B[i];

	ll s = 0;
	for (int i = 1; i <= n; i++) {
		s += A[i];
		if (s > ps[n]) break;

		int ind = lower_bound(ps, ps + n + 1, s) - ps;
		ans = max(ans, s - HMM * (ind + i));
		assert(ps[ind] >= s);
	}
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		double a, b;
		cin >> a >> b;
		A[i] = round(a * HMM);
		B[i] = round(b * HMM);
	}

	sort(A + 1, A + n + 1, greater<ll>());
	sort(B + 1, B + n + 1, greater<ll>());

	f();
	swap(A, B);
	f();

	debug(ans)
	cout << setprecision(4) << fixed << double(ans) / HMM << endl;
	return 0;
}

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