Submission #784659

#	Time	Username	Problem	Language	Result	Execution time	Memory
784659		boris_mihov	Abracadabra (CEOI22_abracadabra)	C++17	0 / 100	3064 ms	33972 KiB

Main

#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <cstring>
#include <vector>
#include <cmath>
#include <stack>

typedef long long llong;
const int MAXN = 200000 + 10;
const int MAXQ = 1000000 + 10;
const llong INF = 1e18;
const int INTINF = 1e9;

int n, q;
llong total;
int a[MAXN];
int b[MAXN];
int output[MAXQ];
std::vector <std::pair <int,int>> v[MAXN];

void riffle()
{
    int pos = 1;
    int lPtr = 1, rPtr = n / 2 + 1;
    while (lPtr < n / 2 + 1 || rPtr < n + 1)
    {
        if (lPtr == n / 2 + 1)
        {
            b[pos++] = a[rPtr++];
            total++;
            continue;
        }

        if (rPtr == n + 1)
        {
            b[pos++] = a[lPtr++];
            continue;
        }

        if (a[lPtr] < a[rPtr])
        {
            b[pos++] = a[lPtr++];
        } else
        {
            b[pos++] = a[rPtr++];
            total++;
        }
    }
    
    for (int i = 1 ; i <= n ; ++i)
    {
        a[i] = b[i];
    }
}

void solve()
{
    int bucketSize = sqrt(n);
    for (int i = 0 ; i <= bucketSize ; ++i)
    {
        for (const auto &[pos, idx] : v[i])
        {
            output[idx] = a[pos];
        }

        riffle();
    }

    total = 0;
    for (int i = bucketSize + 1 ; i <= n ; ++i)
    {
        for (const auto &[pos, idx] : v[i])
        {
            output[idx] = a[pos];
        }

        riffle();
    }

    assert(total <= n * bucketSize);
}

void print()
{
    for (int i = 1 ; i <= q ; ++i)
    {
        std::cout << output[i] << '\n';
    }
}

void input()
{
    std::cin >> n >> q;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> a[i];
    }

    for (int i = 1 ; i <= q ; ++i)
    {
        int t, idx;
        std::cin >> t >> idx;
        v[std::min(t, (int)sqrt(n))].push_back({idx, i});
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();
    print();

    return 0;
}

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