oj.uz

답안 #655408

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
655408 2022-11-04T09:40:21 Z piOOE 3단 점프 (JOI19_jumps) C++17
0 / 100
 39 ms 30152 KB 
#include <bits/stdc++.h>

using namespace std;

constexpr int inf = 1e9 + 7;

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];
    }

    auto func = [&](int i, int j) {
        return a[i] > a[j] ? i : j;
    };

    const int max_log = __lg(n) + bool(n & (n - 1));
    vector<vector<int>> st(max_log);
    st[0].resize(n);
    iota(st[0].begin(), st[0].end(), 0);
    for (int i = 1; i < max_log; ++i) {
        st[i].resize(n - (1 << i) + 1);
        for (int j = 0; j < (int) st[i].size(); ++j) {
            st[i][j] = func(st[i - 1][j], st[i - 1][j + (1 << (i - 1))]);
        }
    }

    vector<int> logn(n + 1);
    for (int i = 2; i <= n; ++i) {
        logn[i] = logn[i >> 1] + 1;
    }

    auto query = [&](int l, int r) {
        int lg = logn[r - l];
        return func(st[lg][l], st[lg][r - (1 << lg)]);
    };

    auto comp = [&](array<int, 3> x, array<int, 3> y) {
        return a[x[0]] > a[y[0]];
    };

    int q;
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        --l;
        vector<int> p;
        set<array<int, 3>, decltype(comp)> pq(comp);
        pq.insert(array{a[query(l, r)], l, r});
        for (int t = 1; t <= 25 && !pq.empty(); ++t) {
            auto [i, L, R] = *pq.begin();
            pq.erase(pq.begin());
            p.push_back(i);
            if (L < i) {
                pq.insert({query(L, i), L, i});
            }
            if (i + 1 < R) {
                pq.insert({query(i + 1, R), i + 1, R});
            }
            while (pq.size() > 25) pq.erase(prev(pq.end()));
        }

        int ans = 0;

        auto relax = [&](int i, int j) {
            int R = j + (j - i);
            if (R < r) {
                ans = max(ans, a[i] + a[j] + a[query(R, r)]);
            }
            int len = j - i - 1;
            if (len > 0) {
                ans = max(ans, a[i] + a[j] + a[query(i + 1, i + 1 + ((len + 1) / 2))]);
            }
            int L = max(l, i - (j - i));
            if (L < i) {
                ans = max(ans, a[i] + a[j] + a[query(L, i)]);
            }
        };

        sort(p.begin(), p.end());

        vector<int> stk;
        for (int i : p) {
            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 << '\n';
    }

    return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 39 ms 30152 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -