Submission #880680

#	Time	Username	Problem	Language	Result	Execution time	Memory
880680		Youssif_Elkadi	Osumnjičeni (COCI21_osumnjiceni)	C++17	110 / 110	878 ms	63188 KiB

Main

#include <bits/stdc++.h>
using namespace std;
const long long N = 2e5 + 5, mod = 1e9 + 7, inf = 1e9 + 5;
int tree[N * 8], lazy[N * 8];
int n;
int cor = 0;
void prob(int l, int r, int node)
{
	tree[node] = min(tree[node], lazy[node]);
	if (l != r)
		lazy[node * 2] = min(lazy[node * 2], lazy[node]), lazy[node * 2 + 1] = min(lazy[node * 2 + 1], lazy[node]);
}
void update(int lq, int rq, int val, int l = 1, int r = cor, int node = 1)
{
	prob(l, r, node);
	if (lq <= l && r <= rq)
	{
		lazy[node] = min(val, lazy[node]);
		prob(l, r, node);
		return;
	}
	if (r < lq || l > rq)
		return;
	int mid = (l + r) / 2;
	update(lq, rq, val, l, mid, node * 2), update(lq, rq, val, mid + 1, r, node * 2 + 1);
	tree[node] = min(tree[node * 2], tree[node * 2 + 1]);
}
int query(int lq, int rq, int l = 1, int r = cor, int node = 1)
{
	prob(l, r, node);
	if (lq <= l && r <= rq)
		return tree[node];
	if (r < lq || l > rq)
		return inf;
	int mid = (l + r) / 2;
	return min(query(lq, rq, l, mid, node * 2), query(lq, rq, mid + 1, r, node * 2 + 1));
}
map<int, int> mp;
int main()
{
	ios_base::sync_with_stdio(0), cin.tie(NULL), cout.tie(NULL);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	memset(lazy, '?', sizeof lazy);
	memset(tree, '?', sizeof tree);
	cin >> n;
	vector<pair<int, int>> arr(n + 1);
	for (int i = 1; i <= n; i++)
		cin >> arr[i].first >> arr[i].second, mp[arr[i].first] = 1, mp[arr[i].second] = 1;
	for (auto &v : mp)
		v.second = ++cor;
	for (int i = 1; i <= n; i++)
		arr[i].first = mp[arr[i].first], arr[i].second = mp[arr[i].second];
	vector<vector<int>> par(n + 2, vector<int>(22, n + 1));
	for (int i = n; i >= 1; i--)
	{
		par[i][0] = par[i + 1][0];
		par[i][0] = min(query(arr[i].first, arr[i].second), par[i][0]);
		update(arr[i].first, arr[i].second, i);
	}
	for (int j = 1; j <= 21; j++)
		for (int i = 1; i <= n; i++)
			par[i][j] = par[par[i][j - 1]][j - 1];
	int q; // code pls unhate me
	cin >> q;
	while (q--)
	{
		int l, r;
		cin >> l >> r; // zengy
		int ans = 1;
		for (int i = 21; i >= 0; i--)
			if (par[l][i] <= r)
				l = par[l][i], ans += (1 << i);
		// aaa the num of teleports is 2^i? YES
		cout << ans << "\n";
	}
}
/*
3
1
3
*/

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 50 / 50