Submission #943629

#	Time	Username	Problem	Language	Result	Execution time	Memory
943629		MinaRagy06	Abracadabra (CEOI22_abracadabra)	C++17	10 / 100	3100 ms	32256 KiB

Main

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

const int N = 200'005;
vector<array<int, 2>> ask[N];
int a[N], ans[1'000'005];
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n, q;
	cin >> n >> q;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int i = 0; i < q; i++) {
		int t, p;
		cin >> t >> p;
		t = min(t, n);
		ask[t].push_back({p - 1, i});
	}
	int nxt[n]{};
	stack<int> st;
	a[n] = 1e9;
	st.push(n);
	for (int i = n - 1; i >= 0; i--) {
		while (a[i] > a[st.top()]) st.pop();
		nxt[i] = st.top();
		st.push(i);
	}
	set<array<int, 2>> s;
	int cnt[n]{};
	for (int i = 0; i < n; i = nxt[i]) {
		cnt[i] = nxt[i] - i;
		s.insert({a[i], i});
	}
	bool isover = 0;
	for (int j = 0; j <= n; j++) {
// 		for (auto [v, i] : s) {
// 			cout << cnt[i] << ' ';
// 		}
// 		cout << '\n';
		for (auto [p, idx] : ask[j]) {
			for (auto [v, i] : s) {
				if (p < cnt[i]) {
					ans[idx] = a[i + p];
					break;
				} else {
					p -= cnt[i];
				}
			}
		}
		if (isover) continue;
		int cur = n / 2;
		for (auto [v, i] : s) {
			if (cur < cnt[i]) {
				if (cur == 0) {
					isover = 1;
					break;
				}
				int mx = i + cnt[i];
				cnt[i] = cur;
				cur = i + cur;
				while (cur < n && cnt[cur] == 0) {
					int newcur = min(nxt[cur], mx);
					cnt[cur] = newcur - cur;
					s.insert({a[cur], cur});
					cur = newcur;
				}
				break;
			} else {
				cur -= cnt[i];
			}
		}
	}
	for (int i = 0; i < q; i++) {
		cout << ans[i] << '\n';
	}
	return 0;
}

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