Submission #621044

#	Time	Username	Problem	Language	Result	Execution time	Memory
621044		Sergio_2357	Boxes with souvenirs (IOI15_boxes)	C++17	20 / 100	1 ms	212 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>

using namespace std;

#define int long long
#define nint signed

typedef vector<int> vi;

int delivery2(nint N, nint K, nint L, nint P[], bool tryp)
{
    //cout << "HELLO " << tryp << endl;
    int n = N;
    int k = K;
    int l = L;
    vi p(n);
    for (int i = 0; i < n; i++)
        p[i] = P[i];
    vi d1(n + 1), d2(n + 1);
    for (int i = 1; i <= n; i++)
        d1[i] = p[i - 1];
    for (int i = 1; i <= n; i++)
        d2[i] = l - p[n - i];
    //for (int x : d1)
    //    cout << x << ' ';
    //cout << endl;
    //for (int x : d2)
    //    cout << x << ' ';
    //cout << endl;
    int rem = n;
    int a1, a2;
    a1 = a2 = 0;
    bool fst = true;
    int res = 0;
    while (rem) {
        int re = min(k, rem);
        int p1 = min(2 * d1[re + a1], l);
        int p2 = min(2 * d2[re + a2], l);
        int ch = 1e18;
        int cp1 = 0;
        int cp2 = 0;
        if (p1 < p2) {
            ch = p1;
            cp1 = re;
        } else {
            ch = p2;
            cp2 = re;
        }
        if (fst && tryp) {
            ch = 1e18;
            for (int i = 1; i < re; i++) {
                int th = (2 * d1[i + a1]) + (2 * d2[re - i + a2]);
                if (th < ch) {
                    ch = th;
                    cp1 = i;
                    cp2 = re - i;
                }
            }
        }
        rem -= re;
        fst = false;
        res += ch;
        a1 += cp1;
        a2 += cp2;
    }
    return res;
}

int delivery(nint N, nint K, nint L, nint P[])
{
    return min(delivery2(N, K, L, P, false), delivery2(N, K, L, P, true));
}

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