Submission #937657

#	Time	Username	Problem	Language	Result	Execution time	Memory
937657		danikoynov	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	508 ms	374492 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll inf = 1e18;
const int maxn = 1e7 + 10;

int n, k;
ll p[maxn], temp[maxn];
ll L;

ll get_price_left(int x)
{
    ll res = 0;
    int t = 0;
    for (int i = x - 1; i >= 0; i --)
    {
        t ++;
        if ((t - 1) % k == 0)
    {
        //cout << t << endl;
        res = res + 2 * p[i];
    }
    }
    return res;
}

ll get_price_right(int x)
{
    ll res = 0;
    int t = 0;
    for (int i = n - x; i < n; i ++)
    {
        t ++;
        if ((t - 1) % k == 0)
        {
            ///cout << t << endl;
            res = res + 2 * (L - p[i]);
        }
    }
    return res;
}

ll pref[maxn], suff[maxn];
long long delivery(int N, int K, int _L, int P[])
{
    for (int i = 0; i < N; i ++)
        p[i] = P[i];

    n = N;
    k = K;
    L = _L;



    //cout << get_price_right(1) << endl;
    ///exit(0);
    ll res = inf;

    for (int i = 1; i <= N; i ++)
    {
        if (i >= k)
            pref[i] += pref[i - k];
        pref[i] += 2 * p[i - 1];
    }

    for (int i = 1; i <= N; i ++)
    {
        if (i >= k)
            suff[i] += suff[i - k];
        suff[i] += 2 * (L - p[N - i]);
    }
    for (int i = 0; i <= N; i ++)
    {
        ll val = pref[i] + suff[N - i];

        ///cout << "split " << i << " " << val << endl;
        res = min(res, val);
        if (N - i - k >= 0)
        {
            //cout << "in" << endl;
            val = pref[i] + suff[N - i - k] + L;
             //cout << "here " << i << " " << N - i - k << " " << val << endl;
            res = min(res, val);
        }
    }


    return res;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30