Submission #1011211

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011211		Forested	Abracadabra (CEOI22_abracadabra)	C++17	0 / 100	3059 ms	20440 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using i32 = int;
using i64 = long long;
template <typename T>
using V = vector<T>;
template <typename T>
using VV = V<V<T>>;
#define OVERRIDE4(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, l, r) for (i32 i = (i32)(l); i < (i32)(r); ++i)
#define REP(...) OVERRIDE4(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER2(i, n) for (i32 i = (i32)(n) - 1; i >= 0; --i)
#define PER3(i, l, r) for (i32 i = (i32)(r) - 1; i >= (i32)(l); --i)
#define PER(...) OVERRIDE4(__VA_ARGS__, PER3, PER2)(__VA_ARGS__)
#define LEN(x) (i32)size(x)
#define ALL(x) begin(x), end(x)
template <typename T>
bool chmin(T &x, const T &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}

V<i32> riffle(V<i32> a) {
    V<i32> b;
    b.reserve(LEN(a));
    i32 l = 0, r = LEN(a) / 2;
    i32 lto = r, rto = LEN(a);
    while (LEN(b) < LEN(a)) {
        if (r == rto || (l < lto && a[l] < a[r])) {
            b.push_back(a[l++]);
        } else {
            b.push_back(a[r++]);
        }
    }
    return b;
}

int main() {
    i32 n, q;
    cin >> n >> q;
    V<i32> a(n);
    REP(i, n) {
        cin >> a[i];
    }
    V<i32> t(q), idx(q);
    REP(i, q) {
        cin >> t[i] >> idx[i];
        --idx[i];
    }
    i32 to = t[0];
    assert(count(ALL(t), to) == q);
    i32 x = 0;
    while (x < to) {
        V<i32> pm(n, 0);
        {
            i32 mx = -1;
            REP(i, n) {
                if (chmax(mx, a[i])) {
                    pm[i] = 1;
                }
            }
        }
        if (pm[n / 2]) {
            break;
        }
        i32 pv = n / 2 - 1;
        while (!pm[pv]) {
            --pv;
        }
        i32 rsz = 0;
        while (rsz < n / 2 && !pm[n / 2 + rsz]) {
            ++rsz;
        }
        i32 ope = min(to - x, 1 + (n / 2 - pv - 1) / rsz);
        REP(i, ope) {
            pm[n / 2 - i * rsz] = 1;
        }
        VV<i32> subs;
        {
            i32 l = 0;
            REP(i, 1, n + 1) {
                if (i == n || pm[i]) {
                    subs.emplace_back(V<i32>(a.begin() + l, a.begin() + i));
                    l = i;
                }
            }
        }
        sort(ALL(subs));
        a.clear();
        for (const V<i32> &sub : subs) {
            for (i32 ele : sub) {
                a.push_back(ele);
            }
        }
        x += ope;
    }
    REP(i, q) {
        cout << a[idx[i]] << '\n';
    }
}

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