Submission #792542

#	Time	Username	Problem	Language	Result	Execution time	Memory
792542		t6twotwo	Abracadabra (CEOI22_abracadabra)	C++17	0 / 100	3069 ms	34252 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N, Q;
    cin >> N >> Q;
    vector<int> A(N);
    for (int &x : A) {
        cin >> x;
    }
    vector<int> queries(Q), ans(Q);
    vector<vector<int>> q(N + 1);
    for (int i = 0; i < Q; i++) {
        int t, p;
        cin >> t >> p;
        t = min(t, N);
        p--;
        queries[i] = p;
        if (t == 0) {
            ans[i] = A[p];
        } else {
            q[t].push_back(i);
        }
    }
    vector<int> f(N, N), stk;
    for (int i = N - 1; i >= 0; i--) {
        while (!stk.empty() && A[stk.back()] < A[i]) {
            stk.pop_back();
        }
        if (!stk.empty()) {
            f[i] = stk.back();
        }
        stk.push_back(i);
    }
    vector<int> bit(N + 1);
    set<tuple<int, int, int>> s, t;
    for (int i = 0; i < N; i = f[i]) {
        s.emplace(A[i], i, f[i]);
        bit[A[i]] += f[i] - i;
    }
    int T = N;
    for (int i = 1; i <= N; i++) {
        if (T > N / 2) {
            while (1) {
                auto [_, l, r] = *prev(s.end());
                if (T - r + l < N / 2) {
                    break;
                }
                T -= r - l;
                t.insert(*prev(s.end()));
                s.erase(prev(s.end()));
            }
            if (T > N / 2) {
                auto [v, l, r] = *prev(s.end());
                s.erase(prev(s.end()));
                bit[v] -= r - l;
                int m = r - T + N / 2;
                s.emplace(v, l, m);
                bit[v] += m - l;
                for (int i = m; i < r; i = f[i]) {
                    s.emplace(A[i], i, min(r, f[i]));
                    bit[A[i]] += min(r, f[i]) - i;
                }
            }
        }
        for (int k : q[i]) {
            int p = queries[k];
            int l = 1, r = N;
            while (l < r) {
                int m = (l + r) / 2, s = 0;
                for (int j = 1; j <= m; j++) {
                    s += bit[j];
                }
                if (s > p) {
                    r = m;
                } else {
                    l = m + 1;
                }
            }
            int a = 0;
            for (int j = 1; j <= l; j++) {
                a += bit[j];
            }
            auto [v, L, R] = *s.lower_bound({l, 0, 0});
            if (v == l) {
                ans[k] = A[R - a + p];
            } else {
                auto [v, L, R] = *t.lower_bound({l, 0, 0});
                ans[k] = A[R - a + p];
            }
        }
    }
    for (int x : ans) {
        cout << x << "\n";
    }
    return 6/22;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25