Submission #1067304

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067304		Andrey	Abracadabra (CEOI22_abracadabra)	C++14	40 / 100	263 ms	25936 KiB

Main

#include<bits/stdc++.h>
using namespace std;

vector<int> haha(200001);
vector<int> p(200001,1e7);
vector<int> idk(200001);
vector<int> bruh(200001);
vector<int> pos(200001);
int n;

void upd(int a, int x) {
    while(a < idk.size()) {
        idk[a]+=x;
        a+=((a)&(-a));
    }
}

bool dude() {
    int c = 0,sb = 0;
    for(int i = 18; i >= 0; i--) {
        if(c+(1 << i) <= n && sb+idk[c+(1 << i)] < n/2) {
            c+=(1 << i);
            sb+=idk[c];
        }
    }
    c++;
    sb+=bruh[c];
    if(sb == n/2) {
        return false;
    }
    int y = pos[c]+bruh[c]-(sb-n/2);
    while(true) {
        if(p[y] < pos[c]+bruh[c]) {
            bruh[haha[y]] = p[y]-y;
            upd(haha[y],bruh[haha[y]]);
        }
        else {
            bruh[haha[y]] = pos[c]+bruh[c]-y;
            upd(haha[y],bruh[haha[y]]);
            break;
        }
        y = p[y];
    }
    upd(c,n/2-sb);
    bruh[c]+=n/2-sb;
    return true;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int q;
    cin >> n >> q;
    for(int i = 1; i <= n; i++) {
        cin >> haha[i];
        pos[haha[i]] = i;
    }
    stack<pair<int,int>> troll;
    for(int i = 1; i <= n; i++) {
        while(!troll.empty() && haha[i] > troll.top().first) {
            p[troll.top().second] = i;
            troll.pop();
        }
        troll.push({haha[i],i});
    }
    int y = 1,big = haha[1];
    for(int i = 2; i <= n/2; i++) {
        if(haha[i] > big) {
            bruh[haha[y]] = i-y;
            y = i;
            big = haha[i];
        }
    }
    bruh[haha[y]] = n/2-y+1;
    big = haha[n/2+1],y = n/2+1;
    for(int i = n/2+1; i <= n; i++) {
        if(haha[i] > big) {
            bruh[haha[y]] = i-y;
            y = i;
            big = haha[i];
        }
    }
    bruh[haha[y]] = n-y+1;
    for(int i = 1; i <= n; i++) {
        upd(i,bruh[i]);
    }
    for(int i = 0; i < q; i++) {
        int t,a;
        cin >> t >> a;
        if(t == 0) {
            cout << haha[a] << "\n";
        }
        else {
            if(i == 0) {
                for(int j = 0; j < t-1; j++) {
                    if(!dude()) {
                        break;
                    }
                }
            }
            int c = 0,sb = 0;
            for(int j = 18; j >= 0; j--) {
                if(c+(1 << j) <= n && sb+idk[c+(1 << j)] < a) {
                    c+=(1 << j);
                    sb+=idk[c];
                }
            }
            c++;
            sb+=bruh[c];
            cout << haha[pos[c]+bruh[c]-1-(sb-a)] << "\n";
        }
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void upd(int, int)':
Main.cpp:12:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     while(a < idk.size()) {
      |           ~~^~~~~~~~~~~~

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