Submission #511472

#	Time	Username	Problem	Language	Result	Execution time	Memory
511472		tabr	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	675 ms	213920 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

long long delivery(int n, int k, int l, int p[]) {
    vector<long long> dp1(n);
    deque<pair<long long, int>> deq;
    deq.emplace_front(0, -1);
    for (int i = 0; i < n; i++) {
        if (deq.front().second < i - k) {
            deq.pop_front();
        }
        dp1[i] = deq.front().first + min(l, p[i] * 2);
        while (!deq.empty() && deq.back().first >= dp1[i]) {
            deq.pop_back();
        }
        deq.emplace_back(dp1[i], i);
    }
    deq.clear();
    vector<long long> dp2(n);
    deq.emplace_front(0, n);
    for (int i = n - 1; i >= 0; i--) {
        if (deq.front().second > i + k) {
            deq.pop_front();
        }
        dp2[i] = deq.front().first + min(l, (l - p[i]) * 2);
        while (!deq.empty() && deq.back().first >= dp2[i]) {
            deq.pop_back();
        }
        deq.emplace_back(dp2[i], i);
    }
    long long res = min(dp1[n - 1], dp2[0]);
    for (int i = 0; i < n - 1; i++) {
        res = min(res, dp1[i] + dp2[i + 1]);
    }
    return res;
}

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

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