Submission #655399

#	Time	Username	Problem	Language	Result	Execution time	Memory
655399		piOOE	Triple Jump (JOI19_jumps)	C++17	27 / 100	23 ms	4788 KiB

jumps

#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }

    vector<int> suf(a);
    for (int i = n - 2; i >= 0; --i) {
        suf[i] = max(suf[i + 1], suf[i]);
    }

    int ans = 0;

    auto relax = [&](int i, int j) {
        int r = j + (j - i);
        if (r < n) {
            ans = max(ans, a[i] + a[j] + suf[r]);
        }
    };

    vector<int> stk;


    for (int i = 0; i < n; ++i) {
        while (!stk.empty() && a[stk.back()] <= a[i]) {
            relax(stk.back(), i);
            stk.pop_back();
        }
        if (!stk.empty()) {
            relax(stk.back(), i);
        }
        stk.push_back(i);
    }

    cout << ans;

    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 27 / 27
• Subtask 4: 0 / 54