Submission #250251

#	Time	Username	Problem	Language	Result	Execution time	Memory
250251		tutis	File Paths (BOI15_fil)	C++17	33 / 100	1094 ms	20472 KiB

fil

/*input
2 4 22
2
0 1
1 5
2 13
2 10
1 4
0 7

*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
int main()
{
	ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0), cerr.tie(0);
	int n, m, k, s;
	cin >> n >> m >> k >> s;
	s++;
	int p[n + 1], d[n + 1], l[n + 1];
	p[0] = -1;
	d[0] = 1;
	for (int i = 1; i <= n; i++)
	{
		cin >> p[i] >> l[i];
		d[i] = d[p[i]] + 1 + l[i];
	}
	vector<int>cikl[n + 1];
	for (int i = 0; i <= n; i++)
	{
		for (int j = i; j != -1; j = p[j])
		{
			cikl[j].push_back(d[i] - d[j] + s);
		}
	}
	function<bool(int, int)>ok = [&](int v, int ilg)
	{
		if (d[v] == ilg)
			return true;
		if (ilg <= 0)
			return false;
		if (v != 0 && ok(p[v], ilg - 1 - l[v]))
			return true;
		for (int w = 0; w <= n; w++)
		{
			//w->v
			if (d[w] + s == ilg)
				return true;
		}
		if (ilg <= d[v])
			return false;
		for (int x : cikl[v])
		{
			if ((ilg - d[v]) % x == 0)
				return true;
		}
		return false;
	};
	while (m--)
	{
		int p, l;
		cin >> p >> l;
		if (ok(p, k - l))
			cout << "YES\n";
		else
			cout << "NO\n";
	}
}

• Subtask 1: 33 / 33
• Subtask 2: 0 / 33
• Subtask 3: 0 / 34