Submission #56152

#	Time	Username	Problem	Language	Result	Execution time	Memory
56152		aquablitz11	Rice Hub (IOI11_ricehub)	C++14	100 / 100	29 ms	13872 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"

using namespace std;
using ll = long long;

const int N = 100010;
ll qsl[N], qsr[N];

int besthub(int n, int L, int pos[], ll budget)
{
    for (int i = 1; i <= n; ++i) {
        qsl[i] += qsl[i-1] + pos[i-1];
        qsr[i] = qsr[i-1] + (L - pos[i-1]);
    }

    auto check = [&] (int cnt) {
        for (int l = 1, r = cnt; r <= n; ++l, ++r) {
            int m = (l+r)/2;
            ll d = qsr[m]-qsr[l-1] - (L-pos[m-1])*1ll*(m-l+1);
            d += qsl[r]-qsl[m] - (pos[m-1])*1ll*(r-m);
            if (d <= budget) return true;
        }
        return false;
    };
    int b = 0;
    int e = n;
    while (b < e) {
        int m = (b+e+1)/2;
        if (check(m))
            b = m;
        else
            e = m-1;
    }
    return b;
}

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32