oj.uz

Submission #747040

# Submission time Handle Problem Language Result Execution time Memory
747040 2023-05-23T13:08:28 Z Szil Index (COCI21_index) C++17
60 / 110
 2500 ms 136324 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 200001;

struct Node {
	Node *l, *r;
	int sum = 0;

	Node(Node *left, Node *right) : l(left), r(right) {
		if (l) sum += l->sum;
		if (r) sum += r->sum;
	}

	Node(int s) : sum(s) {}
};

Node *build(int tl, int tr) {
	if (tl == tr) {
		return new Node(0);
	} else {
		int tm = (tl + tr) / 2;
		return new Node(build(tl, tm), build(tm+1, tr));
	}
}

Node *upd(Node *v, int tl, int tr, int pos) {
	if (tl == tr) {
		return new Node(v->sum+1);
	} else {
		int tm = (tl + tr) / 2;
		if (pos <= tm) {
			return new Node(upd(v->l, tl, tm, pos), v->r);
		} else {
			return new Node(v->l, upd(v->r, tm+1, tr, pos));
		}
	}
}

int qry(Node *v, int tl, int tr, int l, int r) {
	if (l > r) return 0;
	if (l == tl && r == tr) {
		return v->sum;
	} else {
		int tm = (tl + tr) / 2;
		return qry(v->l, tl, tm, l, min(tm, r)) + qry(v->r, tm+1, tr, max(tm+1, l), r);
	}
}

const int MAXV = 200001;

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int n, q; cin >> n >> q;
	vector<Node *> roots = {build(1, MAXV)};
	for (int i = 1; i <= n; i++) {
		int x; cin >> x;
		roots.push_back(upd(roots.back(), 1, MAXV, x));
	}
	while (q--) {
		int l, r; cin >> l >> r;
		int lo = 1, hi = r-l+1;
		while (lo < hi) {
			int mid = (lo + hi + 1) / 2;
			int cnt = qry(roots[r], 1, MAXV, mid, MAXV) - qry(roots[l-1], 1, MAXV, mid, MAXV);
			if (cnt >= mid) {
				lo = mid;
			} else {
				hi = mid - 1;
			}
		}
		cout << lo << "\n";
	}
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 13396 KB Output is correct
2 Correct 17 ms 13340 KB Output is correct
3 Correct 16 ms 13416 KB Output is correct
4 Correct 16 ms 13396 KB Output is correct
5 Correct 17 ms 13396 KB Output is correct
6 Correct 17 ms 13380 KB Output is correct
7 Correct 16 ms 13384 KB Output is correct
8 Correct 15 ms 13396 KB Output is correct
9 Correct 16 ms 13408 KB Output is correct
10 Correct 16 ms 13408 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 13396 KB Output is correct
2 Correct 17 ms 13340 KB Output is correct
3 Correct 16 ms 13416 KB Output is correct
4 Correct 16 ms 13396 KB Output is correct
5 Correct 17 ms 13396 KB Output is correct
6 Correct 17 ms 13380 KB Output is correct
7 Correct 16 ms 13384 KB Output is correct
8 Correct 15 ms 13396 KB Output is correct
9 Correct 16 ms 13408 KB Output is correct
10 Correct 16 ms 13408 KB Output is correct
11 Correct 362 ms 43652 KB Output is correct
12 Correct 397 ms 43576 KB Output is correct
13 Correct 331 ms 43544 KB Output is correct
14 Correct 349 ms 43652 KB Output is correct
15 Correct 396 ms 43588 KB Output is correct
16 Correct 355 ms 43560 KB Output is correct
17 Correct 348 ms 43636 KB Output is correct
18 Correct 415 ms 43504 KB Output is correct
19 Correct 349 ms 43716 KB Output is correct
20 Correct 357 ms 43488 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 13396 KB Output is correct
2 Correct 17 ms 13340 KB Output is correct
3 Correct 16 ms 13416 KB Output is correct
4 Correct 16 ms 13396 KB Output is correct
5 Correct 17 ms 13396 KB Output is correct
6 Correct 17 ms 13380 KB Output is correct
7 Correct 16 ms 13384 KB Output is correct
8 Correct 15 ms 13396 KB Output is correct
9 Correct 16 ms 13408 KB Output is correct
10 Correct 16 ms 13408 KB Output is correct
11 Correct 362 ms 43652 KB Output is correct
12 Correct 397 ms 43576 KB Output is correct
13 Correct 331 ms 43544 KB Output is correct
14 Correct 349 ms 43652 KB Output is correct
15 Correct 396 ms 43588 KB Output is correct
16 Correct 355 ms 43560 KB Output is correct
17 Correct 348 ms 43636 KB Output is correct
18 Correct 415 ms 43504 KB Output is correct
19 Correct 349 ms 43716 KB Output is correct
20 Correct 357 ms 43488 KB Output is correct
21 Correct 2498 ms 136324 KB Output is correct
22 Execution timed out 2555 ms 136244 KB Time limit exceeded
23 Halted 0 ms 0 KB -