oj.uz

Submission #943648

# Submission time Handle Problem Language Result Execution time Memory
943648 2024-03-11T17:21:35 Z MinaRagy06 Abracadabra (CEOI22_abracadabra) C++17
10 / 100
 3000 ms 25844 KB 
#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];
struct segtree {
	int leaf[N];
	int n;
	void init(int _n) {
		n = _n;
		for (int i = 0; i < n; i++) {
			leaf[i] = 0;
		}
	}
	void upd(int i, int x) {
		leaf[i] = x;
	}
	array<int, 2> get(int p) {
		for (int i = 0; i < n; i++) {
			if (p < leaf[i]) {
				return {i, p};
			} else {
				p -= leaf[i];
			}
		}
	}
	int get2(int p) {
		return leaf[p];
	}
} seg;
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n, q;
	cin >> n >> q;
	int pos[n + 1];
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		pos[a[i]] = 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;
	seg.init(n + 1);
	for (int i = 0; i < n; i = nxt[i]) {
		seg.upd(a[i], nxt[i] - i);
		s.insert({a[i], i});
	}
	bool isover = 0;
	for (int j = 0; j <= n; j++) {
		for (auto [p, idx] : ask[j]) {
			auto [i, v] = seg.get(p);
			ans[idx] = a[pos[i] + v];
		}
		if (isover) continue;
		int cur = n / 2;
		array<int, 2> V = seg.get(cur);
		int i = pos[V[0]];
		cur = V[1];
		if (cur == 0) {
			isover = 1;
			continue;
		}
		int mx = i + seg.get2(a[i]);
		seg.upd(a[i], cur);
		cur = i + cur;
		while (cur < n && seg.get2(a[cur]) == 0) {
			int newcur = min(nxt[cur], mx);
			seg.upd(a[cur], newcur - cur);
			cur = newcur;
		}
	}
	for (int i = 0; i < q; i++) {
		cout << ans[i] << '\n';
	}
	return 0;
}

Compilation message

Main.cpp: In member function 'std::array<int, 2> segtree::get(int)':
Main.cpp:28:2: warning: control reaches end of non-void function [-Wreturn-type]
   28 |  }
      |  ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 468 ms 24660 KB Output is correct
2 Correct 421 ms 23440 KB Output is correct
3 Correct 423 ms 22988 KB Output is correct
4 Correct 621 ms 22752 KB Output is correct
5 Correct 643 ms 25052 KB Output is correct
6 Correct 596 ms 25688 KB Output is correct
7 Correct 625 ms 25844 KB Output is correct
8 Correct 583 ms 24284 KB Output is correct
9 Correct 596 ms 23288 KB Output is correct
10 Correct 597 ms 22868 KB Output is correct
11 Correct 614 ms 23584 KB Output is correct
12 Correct 589 ms 21656 KB Output is correct
13 Correct 598 ms 22392 KB Output is correct
14 Correct 617 ms 24404 KB Output is correct
15 Correct 629 ms 22768 KB Output is correct
16 Correct 2 ms 8280 KB Output is correct
17 Correct 379 ms 21824 KB Output is correct
18 Correct 548 ms 21688 KB Output is correct
19 Correct 2 ms 8280 KB Output is correct
20 Correct 2 ms 8284 KB Output is correct

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3073 ms 17964 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3046 ms 11404 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 468 ms 24660 KB Output is correct
2 Correct 421 ms 23440 KB Output is correct
3 Correct 423 ms 22988 KB Output is correct
4 Correct 621 ms 22752 KB Output is correct
5 Correct 643 ms 25052 KB Output is correct
6 Correct 596 ms 25688 KB Output is correct
7 Correct 625 ms 25844 KB Output is correct
8 Correct 583 ms 24284 KB Output is correct
9 Correct 596 ms 23288 KB Output is correct
10 Correct 597 ms 22868 KB Output is correct
11 Correct 614 ms 23584 KB Output is correct
12 Correct 589 ms 21656 KB Output is correct
13 Correct 598 ms 22392 KB Output is correct
14 Correct 617 ms 24404 KB Output is correct
15 Correct 629 ms 22768 KB Output is correct
16 Correct 2 ms 8280 KB Output is correct
17 Correct 379 ms 21824 KB Output is correct
18 Correct 548 ms 21688 KB Output is correct
19 Correct 2 ms 8280 KB Output is correct
20 Correct 2 ms 8284 KB Output is correct
21 Execution timed out 3073 ms 17964 KB Time limit exceeded
22 Halted 0 ms 0 KB -