제출 #923499

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
923499		Andrei_ierdnA	Sure Bet (CEOI17_sure)	C++17	100 / 100	70 ms	3724 KiB

sure

#include <iostream>
#include <iomanip>
#include <cmath>
#include <algorithm>

using namespace std;

long long n, i, j, cnt;
long long a[100010], b[100010], suma, sumb, ans = 0;
long double x;

bool descCmp(long long x, long long y)
{
    return x > y;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for (i = 1; i <= n; i++) {
        cin >> x;
        x *= 10000LL;
        a[i] = round(x);
        cin >> x;
        x *= 10000LL;
        b[i] = round(x);
    }
    sort(a+1, a+n+1, descCmp);
    sort(b+1, b+n+1, descCmp);
    i = j = 1;
    for (cnt = 1; cnt <= 2*n; cnt++) {
        if (i == n+1 || (j <= n && sumb + b[j] <= suma)) {
            sumb += b[j++];
        }
        else {
            suma += a[i++];
        }
        ans = max(ans, min(suma, sumb) - 10000LL * cnt);
        if (i > 1 && j <= n) {
            ans = max(ans, min(suma - a[i-1], sumb + b[j]) - 10000LL * cnt);
        }
    }
    x = ans;
    x /= 10000LL;
    cout << fixed << setprecision(4);
    cout << x;
    return 0;
}

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