Submission #287133

#	Time	Username	Problem	Language	Result	Execution time	Memory
287133		Kastanda	Boxes with souvenirs (IOI15_boxes)	C++11	20 / 100	1 ms	512 KiB

boxes

// M
#include<bits/stdc++.h>
#include "boxes.h"
using namespace std;
typedef long long ll;
const int N = 10000007;
int n, k, L, A[N];
ll P[N], S[N];

long long delivery(int _n, int _k, int _L, int _p[])
{
        k = _k; L = _L;
        for (int i = 0; i < _n; i ++)
                if (_p[i])
                        A[++ n] = _p[i];

        ll Mn = (n + k - 1) / k * (ll)L;
        for (int i = 1; i <= n; i ++)
        {
                P[i] = P[i - 1];
                if (i % k == 0)
                        P[i] += A[i];
        }
        for (int i = n; i; i --)
        {
                S[i] = S[i + 1];
                if ((n - i + 1) % k == 0)
                        S[i] += L - A[i];
        }
        for (int i = 0; i <= n; i ++)
        {
                ll p = 0, s = 0;
                if (i) p = P[i - 1] + A[i];
                if (i < n) s = S[i + 2] + L - A[i + 1];
                Mn = min(Mn, (p + s) * 2LL);

                ll s2 = 0;
                if (i + k + 1 <= n)
                        s2 = S[i + k + 2] + L - A[i + k + 1];

                Mn = min(Mn, (p + s2) * 2LL + L);
        }
        return Mn;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30