Submission #92953

#	Time	Username	Problem	Language	Result	Execution time	Memory
92953		Kastanda	Sure Bet (CEOI17_sure)	C++11	100 / 100	102 ms	3736 KiB

sure

#include<bits/stdc++.h>
using namespace std;
const int N = 100005;
int n;
long long A[N], B[N];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0); cin >> n;
    for (int i = 1; i <= n; i++)
    {
        long double a, b;
        cin >> a >> b;
        A[i] = (long long)(a * 10000000000LL);
        B[i] = (long long)(b * 10000000000LL);
    }
    sort(A + 1, A + n + 1);
    sort(B + 1, B + n + 1);
    reverse(A + 1, A + n + 1);
    reverse(B + 1, B + n + 1);
    for (int i = 1; i <= n; i++)
    {
        A[i] += A[i - 1];
        B[i] += B[i - 1];
    }
    long long Mx = 0;
    for (int k = 1; k <= n + n; k ++)
    {
        int l = 0, r = k, md;
        if (k > n)
            l = k - n, r = n;
        while (r - l > 1)
        {
            md = (l + r) >> 1;
            if (B[md] >= A[k - md])
                r = md;
            else
                l = md;
        }
        for (int i = max(k - n, l - 2); i <= min(n, r + 2); i++)
            Mx = max(Mx, min(B[i], A[k - i]) - k * 10000000000LL);
    }
    long double res = Mx; res /= (long double)(10000000000.0);
    cout << fixed << setprecision(4) << res << endl;
    return (0);
}

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