#include <bits/stdc++.h> using namespace std; #define MOD1 1000000007 #define MOD2 998244353 #define fir first #define sec second #define pushf push_front #define pushb push_back #define popf pop_front #define popb pop_back #define mp make_pair #define all(a) a.begin(), a.end() #define lbound(v, x) lower_bound(all(v), x) - v.begin() #define ubound(v, x) upper_bound(all(v), x) - v.begin() #define chmax(a, b) a = max(a, b) #define chmin(a, b) a = min(a, b) #define FOR1(a) for (int _ = 0; _ < (a); ++_) #define FOR2(i, a) for (int i = 0; i < (a); ++i) #define FOR3(i, a, b) for (int i = (a); i < (b); ++i) #define RFOR1(a) for (int _ = (a)-1; _ >= 0; --_) #define RFOR2(i, a) for (int i = (a)-1; i >= 0; --i) #define RFOR3(i, a, b) for (int i = (b)-1; i >= (a); --i) #define overload3(a, b, c, d, ...) d // Always choose the fourth argument to call. Hence, which function to call is determined by the number of given arguments. #define REP(...) overload3(__VA_ARGS__, FOR3, FOR2, FOR1)(__VA_ARGS__) #define RREP(...) overload3(__VA_ARGS__, RFOR3, RFOR2, RFOR1)(__VA_ARGS__) typedef long long ll; typedef pair<int, int> pii; typedef vector<int> vi; typedef pair<ll, ll> pll; typedef vector<ll> vll; typedef vector<bool> vb; typedef vector<char> vc; typedef vector<string> vs; typedef vector<pii> vpii; typedef vector<pll> vpll; typedef vector<vi> vvi; typedef vector<vll> vvll; typedef vector<vb> vvb; typedef vector<vc> vvc; typedef vector<vpii> vvpii; typedef vector<vpll> vvpll; typedef queue<int> qi; typedef queue<ll> qll; typedef queue<pii> qpii; typedef queue<pll> qpll; typedef deque<int> dqi; typedef deque<ll> dqll; typedef deque<pii> dqpii; typedef deque<pll> dqpll; typedef priority_queue<int> pqi; typedef priority_queue<ll> pqll; typedef priority_queue<pii> pqpii; typedef priority_queue<pll> pqpll; typedef priority_queue<int, vi, greater<int> > r_pqi; typedef priority_queue<ll, vll, greater<ll> > r_pqll; typedef priority_queue<pii, vpii, greater<pii> > r_pqpii; typedef priority_queue<pll, vpll, greater<pll> > r_pqpll; int main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n, m, q; cin>>n>>m>>q; vvi adj(n); REP(i, m) { int a, b; cin>>a>>b; adj[b-1].pushb(a-1); } int sq = 150; vi from(n, -1); vvpii rec(n); REP(i, n) { vi tmp; tmp.reserve(n); for(int v : adj[i]) { for(auto [d, x] : rec[v]) { if(from[x] == -1) { tmp.pushb(x); from[x] = d+1; } else { chmax(from[x], d+1); } } } rec.reserve(n); for(int v : tmp) { rec[i].pushb(mp(from[v], v)); from[v] = -1; } rec[i].pushb(mp(0, i)); // cerr<<rec[i].size()<<endl; sort(all(rec[i]), greater<pii>()); if(rec[i].size() > sq) { rec[i].erase(rec[i].begin() + sq, rec[i].end()); } } vb block(n, 0); REP(i, q) { int t, l; cin>>t>>l; t--; vi c(l); REP(j, l) { cin>>c[j]; c[j]--; block[c[j]] = 1; } int ans = -1; if(l < sq) { // cerr<<endl; for(auto [d, x] : rec[t]) { // cerr<<d<<' '<<x<<endl; if(block[x] == 0) { ans = d; break; } } } else { vi dp(t+1, -1); dp[t] = 0; RREP(i, t+1) { if(dp[i] == -1) { continue; } if(block[i] == 0) { chmax(ans, dp[i]); } for(int v : adj[i]) { chmax(dp[v], dp[i]+1); } } } cout<<ans<<endl; REP(i, l) { block[i] = 0; } } }