Submission #862271

#	Time	Username	Problem	Language	Result	Execution time	Memory
862271		TAhmed33	Osumnjičeni (COCI21_osumnjiceni)	C++98	0 / 110	97 ms	3540 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int main () {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	pair <int, int> arr[n + 1];
	for (int i = 1; i <= n; i++) cin >> arr[i].first >> arr[i].second;
	int nxt[n + 1] = {};
	nxt[n] = n;
	for (int i = n - 1; i >= 1; i--) {
		nxt[i] = n;
		set <pair <int, int>> cur;
		cur.insert(arr[i]);
		for (int j = i + 1; j <= n; j++) {
			auto l = cur.lower_bound({arr[j].second + 1, 0});
			if (l == cur.begin()) {
				cur.insert(arr[j]);
				continue;
			}
			l--;
			auto x = *l;
			if (arr[j].first <= x.first && x.first <= arr[j].second) {
				nxt[i] = j - 1;
				break;
			}
			if (arr[j].first <= x.second && x.second <= arr[j].second) {
				nxt[i] = j - 1;
				break;
			}
			cur.insert(arr[j]);
		}
	}
	int q;
	cin >> q;
	while (q--) {
		int l, r;
		cin >> l >> r;
		int dp[n + 1] = {}; dp[r] = 1;
		for (int i = r - 1; i >= l; i--) {
			dp[i] = (nxt[i] == r ? 0 : 1e9);
			for (int j = i; j <= min(r - 1, nxt[i]); j++) {
				dp[i] = min(dp[i], dp[j + 1]);
			}
			dp[i]++;
		}
		cout << dp[l] << '\n';
	}
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 50