제출 #232128

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
232128		Kubalionzzale	Safety (NOI18_safety)	C++14	100 / 100	67 ms	3704 KiB

safety

#include <iostream>
#include <queue>
#include <algorithm>
#include <vector>

using ll = long long int;

ll h;

int main()
{
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);
    std::priority_queue<ll> leftprioq;

    std::priority_queue<ll,
                        std::vector<ll>,
                        std::greater<ll> > rightprioq;

    ll n, x, ans = 0;
    std::cin >> n >> h;

    std::cin >> x;
    leftprioq.push(x);
    rightprioq.push(x);

    for (int i = 1; i < n; ++i)
    {
        std::cin >> x;
        ll leftnodepos = leftprioq.top() - h*i;
        ll rightnodepos = rightprioq.top() + h*i;

        if (x < leftnodepos)
        {
            leftprioq.pop();

            leftprioq.push(x + h * i);
            leftprioq.push(x + h * i);

            ans += leftnodepos - x;

            rightprioq.push(leftnodepos - h * i);
        }
        else if (x > rightnodepos)
        {
            rightprioq.pop();

            rightprioq.push(x - h*i);
            rightprioq.push(x - h*i);

            ans += x - rightnodepos;

            leftprioq.push(rightnodepos + h * i);
        }
        else
        {
            leftprioq.push(x + h *i);
            rightprioq.push(x-h*i);
        }
    }

    std::cout << ans;
}

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