Submission #698071

#	Time	Username	Problem	Language	Result	Execution time	Memory
698071		finn__	City (BOI06_city)	C++17	90 / 100	1084 ms	16748 KiB

city

#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    uint64_t n, t, k;
    cin >> n >> t >> k;
    uint64_t const w = sqrt(n);

    vector<uint64_t> c(k), curr_floor(w, 0);
    for (uint64_t &x : c)
        cin >> x;

    auto compare_cost = [&c, &curr_floor, &t](uint64_t x, uint64_t y)
    {
        return t * x + c[curr_floor[x]] > t * y + c[curr_floor[y]];
    };

    priority_queue<uint64_t, vector<uint64_t>, decltype(compare_cost)> q(compare_cost);
    for (uint64_t i = 0; i < w; i++)
        q.push(i);
    uint64_t leftover = n, cost = 0;

    while (leftover)
    {
        uint64_t x = q.top();
        q.pop();
        cost += min(leftover, 4 * (x + 1)) * (t * x + c[curr_floor[x]]);
        leftover -= min(leftover, 4 * (x + 1));
        curr_floor[x]++;
        if (curr_floor[x] < k)
            q.push(x);
    }

    cout << cost << '\n';
}

• Subtask 1: 90 / 100