Submission #707404

#	Time	Username	Problem	Language	Result	Execution time	Memory
707404		tht2005	Boxes with souvenirs (IOI15_boxes)	C++17	10 / 100	1 ms	336 KiB

boxes

#include <bits/stdc++.h>

using namespace std;

#define LL long long

LL delivery(int N, int K, int L, int pos[]) {
    vector<LL> f(N);
    for(int i = 0; i < N; ++i) {
        f[i] = pos[i] + min(pos[i], L - pos[i]);
        if(i >= K) {
            f[i] += f[i - K];
        }
    }
    vector<LL> g(N);
    for(int i = N - 1; i >= 0; --i) {
        g[i] = L - pos[i] + min(pos[i], L - pos[i]);
        if(i + K < N) {
            g[i] += g[i + K];
        }
    }
    LL res = 1LL << 60;
    for(int i = 0; i < N; ++i) {
        res = min(res, f[i] + (i + 1 < N ? g[i + 1] : 0));
    }
    return res;
}

#ifdef tomoshibi
int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int n, k, l, pos[100];
    cin >> n >> k >> l;
    for(int i = 0; i < n; ++i) {
        cin >> pos[i];
    }
    cout << delivery(n, k, l, pos);
    return 0;
}
#endif

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