Submission #383467

#	Time	Username	Problem	Language	Result	Execution time	Memory
383467		morato	Bitaro’s Party (JOI18_bitaro)	C++17	14 / 100	97 ms	9832 KiB

bitaro

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e5 + 5;

vector<int> adj[MAXN];

int mark[MAXN], ans[MAXN], in[MAXN];
bool valid[MAXN];

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, m, q;
	cin >> n >> m >> q;
	fill(ans, ans + n + 1, -1);
	for (int i = 0; i < m; i++) {
		int a, b;
		cin >> a >> b;
		adj[b].push_back(a);
		in[a]++;
	}
	int t, y;
	cin >> t >> y;
	for (int i = 0; i < y; i++) {
		int x;
		cin >> x;
		mark[x] = 1;
	}
	vector<int> lista;
	for (int i = 1; i <= n; i++) {
		if (!in[i]) {
			lista.push_back(i);
		}
	}
	valid[t] = true;
	ans[t] = 0;
	for (int i = 0; i < (int) lista.size(); i++) {
		int cur = lista[i];
		for (int nxt : adj[cur]) {
			if (valid[cur]) {
				ans[nxt] = max(ans[nxt], ans[cur] + 1);
				valid[nxt] = true;
			}
			in[nxt]--;
			if (!in[nxt]) lista.push_back(nxt);
		}
	}
	int resp = -1;
	for (int i = 1; i <= t; i++) {
		if (!mark[i]) resp = max(resp, ans[i]);
	}
	cout << resp << '\n';
	return 0; 
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86