Submission #1036809

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036809		vjudge1	Abracadabra (CEOI22_abracadabra)	C++17	0 / 100	3099 ms	32056 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define sort undefined_function // To use stable_sort instead sort 
#define bpc __builtin_popcount
#define ull unsigned long long
#define ld double
#define ll long long
#define mp make_pair
#define F first
#define S second

#pragma GCC optimize("O3")
using namespace std;

int32_t main() {
        ios_base::sync_with_stdio(0);
        cin.tie(0);

        int n, q;
        cin >> n >> q;

        vector<int> v(n + 1);
        for (int i = 1; i <= n; i ++) 
                cin >> v[i];

        vector<pair<pair<int, int>, int>>qr(q + 1);

        for (int i = 1; i <= q; i ++) {
                cin >> qr[i].F.F >> qr[i].F.S;
                qr[i].S = i;
        }

        stable_sort(qr.begin() + 1, qr.end());
        vector<int> ans(q + 1, -1);

        int i1 = 0, i2 = 0;
        int HALF = n / 2;
        vector<int> half1(HALF), half2(HALF);

        int iter = 1;
        for (int i = 0; iter < q; i ++) {
                while (iter < q && qr[iter].F.F == i) {
                        ans[qr[iter].S] = v[qr[iter].F.S];
                        iter ++;
                }

                i1 = i2 = 0;
                for (int j = 1; j <= HALF; j ++, i1 ++) 
                       half1[i1] = v[j];
                for (int j = HALF + 1; j <= n; j ++, i2 ++) 
                       half2[i2] = v[j];

                i1 = i2 = 0;
                int tmp = 1;
                while (i1 < HALF && i2 < HALF) {
                        if (half1[i1] < half2[i2]) {
                                v[tmp] = half1[i1];
                                i1 ++;
                        } else {
                                v[tmp] = half2[i2];
                                i2 ++;
                        }

                        tmp ++;
                }

                while (i1 < HALF) {
                        v[tmp] = half1[i1];
                        i1  ++;
                        tmp ++;
                }
                while (i2 < HALF) {
                        v[tmp] = half2[i2];
                        i2  ++;
                        tmp ++;
                }

                if (is_sorted(v.begin() + 1, v.end())) 
                        break;
        }

        for (int i = 1; i <= n; i ++) 
                if (ans[qr[i].S] == -1) 
                        ans[qr[i].S] = v[qr[i].F.S];

        for (int i = 1; i <= q; i ++) {
                cout << ans[i] << "\n";
        }

        return 0;
}

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