Submission #412991

#	Time	Username	Problem	Language	Result	Execution time	Memory
412991		Bench0310	Safety (NOI18_safety)	C++17	100 / 100	164 ms	16796 KiB

safety

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef __int128 i128;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    ll h;
    cin >> n >> h;
    i128 m=0,b=0;
    priority_queue<i128> l;
    priority_queue<i128,vector<i128>,greater<i128>> r;
    i128 dl=0,dr=0; //real value is x+dx
    for(int i=0;i<n;i++)
    {
        ll s;
        cin >> s;
        //f->g
        dl-=h;
        dr+=h;
        b+=(m*h);
        //add c
        if(i==0||s<=l.top()+dl)
        {
            l.push(s-dl);
            l.push(s-dl);
            i128 t=l.top()+dl;
            l.pop();
            r.push(t-dr);
        }
        else
        {
            r.push(s-dr);
            r.push(s-dr);
            i128 t=r.top()+dr;
            r.pop();
            l.push(t-dl);
        }
        m--;
        b+=s;
    }
    vector<i128> v;
    for(int i=0;i<n;i++)
    {
        i128 t=l.top();
        l.pop();
        v.push_back(t+dl);
    }
    reverse(v.begin(),v.end());
    for(int i=0;i<n;i++)
    {
        i128 t=r.top();
        r.pop();
        v.push_back(t+dr);
    }
    i128 res=(1ll<<60);
    for(i128 x:v)
    {
        i128 y=m*x+b;
        m++;
        b=y-m*x;
        res=min(res,y);
    }
    cout << ll(res) << "\n";
    return 0;
}

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 9 / 9
• Subtask 4: 5 / 5
• Subtask 5: 6 / 6
• Subtask 6: 11 / 11
• Subtask 7: 11 / 11
• Subtask 8: 22 / 22
• Subtask 9: 29 / 29