Submission #708743

#	Time	Username	Problem	Language	Result	Execution time	Memory
708743		becaido	Abracadabra (CEOI22_abracadabra)	C++17	10 / 100	1025 ms	524288 KiB

Main

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,popcnt,sse4,abm")
#include <bits/stdc++.h>
using namespace std;

#ifdef WAIMAI
#define debug(HEHE...) cout << "[" << #HEHE << "] : ", dout(HEHE)
void dout() {cout << '\n';}
template<typename T, typename...U>
void dout (T t, U...u) {cout << t << (sizeof... (u) ? ", " : ""), dout (u...);}
#else
#define debug(...) 7122
#endif

#define ll long long
#define Waimai ios::sync_with_stdio(false), cin.tie(0)
#define FOR(x,a,b) for (int x = a, I = b; x <= I; x++)
#define pb emplace_back
#define F first
#define S second

const int SIZE = 2e5 + 5;
const int QSIZ = 1e6 + 5;

int n, q;
int a[SIZE], b[SIZE], ans[QSIZ];
tuple<int, int, int> ask[QSIZ];
vector<int> v[SIZE];

int bit[SIZE];
void upd(int pos, int x) {
    for (; pos <= n; pos += pos & -pos) bit[pos] += x;
}
int que(int pos) {
    int re = 0;
    for (; pos; pos -= pos & -pos) re += bit[pos];
    return re;
}
int sch(int x) {
    int pos = 0, sum = 0;
    for (int i = __lg(n); i >= 0; i--) if (pos + (1 << i) <= n && sum + bit[pos + (1 << i)] <= x) {
        sum += bit[pos += 1 << i];
    }
    return pos + 1;
}

bool work() {
    int k = sch(n / 2), sum = que(k - 1);
    if (sum == n / 2) return 0;
    vector<int> nv;
    int ncnt = v[k].size() - (n / 2 - sum);
    FOR (i, v[k].size() - ncnt, v[k].size() - 1) nv.pb(v[k][i]);
    FOR (i, 1, ncnt) v[k].pop_back();
    upd(k, -ncnt);
    int mx = 0, cnt = 0;
    for (int i = 0; i < nv.size(); i++) {
        if (nv[i] > mx) mx = nv[i], cnt = 0;
        v[mx].pb(nv[i]);
        cnt++;
        if (i == nv.size() - 1 || nv[i + 1] > mx) upd(mx, cnt);
    }
    return 1;
}

int cal(int p) {
    int k = sch(p - 1), sum = que(k - 1);
    return v[k][p - sum - 1];
}

void solve() {
    cin >> n >> q;
    FOR (i, 1, n) cin >> a[i];
    //iota(a + 1, a + n + 1, 1);
    //shuffle(a + 1, a + n + 1, mt19937(time(NULL)));
    FOR (i, 1, q) {
        auto &[t, p, id] = ask[i];
        cin >> t >> p;
        id = i;
    }

    int mx = 0, cnt = 0;
    FOR (i, 1, n) {
        if (a[i] > mx) mx = a[i], cnt = 0;
        v[mx].pb(a[i]);
        cnt++;
        if (i == n || a[i + 1] > mx) upd(mx, cnt);
    }

    sort(ask + 1, ask + q + 1);
    int cur = 0, f = 1;
    FOR (i, 1, q) {
        auto [t, p, id] = ask[i];
        while (f && cur < t) {
            f &= work();
            cur++;
        }
        ans[id] = cal(p);
    }
    FOR (i, 1, q) cout << ans[i] << '\n';
}

int main() {
    Waimai;
    solve();
}

Compilation message (stderr)

Main.cpp: In function 'bool work()':
Main.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for (int i = 0; i < nv.size(); i++) {
      |                     ~~^~~~~~~~~~~
Main.cpp:60:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         if (i == nv.size() - 1 || nv[i + 1] > mx) upd(mx, cnt);
      |             ~~^~~~~~~~~~~~~~~~

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