제출 #383392

#제출 시각아이디문제언어결과실행 시간메모리
383392moratoBitaro’s Party (JOI18_bitaro)C++17
0 / 100
4 ms2796 KiB
#include <bits/stdc++.h> using namespace std; const int MAXN = 1e5 + 5; vector<int> adj[MAXN]; int mark[MAXN], ans[MAXN], in[MAXN]; int a[2 * MAXN], b[2 * MAXN]; int main(){ ios::sync_with_stdio(false); cin.tie(0); int n, m, q; cin >> n >> m >> q; for (int i = 0; i < m; i++) { cin >> a[i] >> b[i]; adj[b[i]].push_back(a[i]); in[a[i]]++; } int t, k; cin >> t >> k; for (int i = 0; i < k; i++) { int x; cin >> x; mark[x] = 1; } vector<int> lista; for (int i = t + 1; i <= n; i++) { if (!in[i]) lista.push_back(i); } for (int i = 0; i < (int) lista.size(); i++) { int cur = lista[i]; for (int nxt : adj[cur]) { in[nxt]--; if (!in[nxt] && nxt > t) lista.push_back(nxt); } } lista.clear(); for (int i = 1; i <= n; i++) { if (!in[i]) lista.push_back(i); } assert(!in[t]); ans[t] = 0; for (int i = 0; i < (int) lista.size(); i++) { int cur = lista[i]; // cout << cur << " -> "; for (int nxt : adj[cur]) { ans[nxt] = max(ans[nxt], ans[cur] + 1); in[nxt]--; if (!in[nxt]) lista.push_back(nxt); } } // cout << '\n'; int resp = -1; for (int i = 1; i <= t; i++) { // cout << i << " -> " << ans[i] << '\n'; if (!mark[i]) resp = max(resp, ans[i]); } cout << resp << '\n'; return 0; }
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