Submission #923189

#	Time	Username	Problem	Language	Result	Execution time	Memory
923189		Macker	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	1 ms	348 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
 
using namespace std;
typedef long long ll;
#define all(v) v.begin(), v.end()

long long delivery(int N, int K, int L, int p[]) {
    ll n = N;
    ll k = K;
    ll l = L;
    vector<ll> v(p, p + N);
    ll dist = 0;
    ll s = 0, e = n;
    for (ll i = k - 1; i < n && v[i] <= l / 2; i += k) {
        dist += 2 * v[i];
        s = i + 1;
    }

    for (ll i = n - k; i >= 0 && v[i] > l / 2; i -= k) {
        dist += 2 * (l - v[i]);
        e = i;
    }

    ll a = 0;
    for (ll i = s; i < n && v[i] <= l / 2; i++) {
        a = 2 * v[i];
    }
    ll b = 0;
    for (ll i = e - 1; i >= 0 && v[i] > l / 2; i--) {
        b = 2 * (l - v[i]);
    }

    ll mxs, mxe, mx = -1;
    for (ll i = 0; i < n - k; i++) {
        if(i <= s && i + k >= e){
            if(p[i + k - 1] - p[i] > mx){
                mx = p[i + k - 1] - p[i];
                mxs = i;
                mxe = i + k - 1;
            }
        }
    }
    if(mx == -1) return dist + a + b;

    ll sub = l + (p[mxs] - p[s]) + (p[e] - p[mxe]);

    return min(dist + a + b, dist + sub);
}

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