This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
vector<pii> best[100003];
vector<int> graph[100003];
vector<int> rev[100003];
bool toff[100003];
int vis[100003];
int dp[100003];
const int siz=300;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int n,m,q;
cin >> n >> m >> q;
for (int i = 1,s,t; i<=m; i++){
cin >> s >> t;
graph[s].push_back(t);
rev[t].push_back(s);
}
// priority_queue<pii> pq;
// for (int i = 1; i<=n; i++){
// pq.push({0,i});
// for (auto u : rev[i]){
// for (auto [v,d] : best[u]){
// pq.push({d+1,v});
// }
// }
// for (;best[i].size()<siz && pq.size();pq.pop()){
// auto [d,v] = pq.top();
// if (vis[v]!=i){
// vis[v]=i;
// best[i].push_back({v,d});
// }
// }
// for(;pq.size();pq.pop());
// }
vector<int> wej;
for (int i = 1, fin, num; i<=q; i++){
cin >> fin >> num;
for (int j = 1, v; j<=num; j++){
cin >> v;
wej.push_back(v);
}
for (auto u : wej)toff[u]=true;
// if (num>=siz){
if (true){
fill(dp,dp+fin+1,-1);
dp[fin]=0;
for (int i = fin; i>0; i--){
if (dp[i]==-1)continue;
for (auto u : rev[i]){
dp[u]=max(dp[i]+1,dp[u]);
}
}
int ans=-1;
for (int i = 1; i<=fin; i++)if (!toff[i])ans=max(ans,dp[i]);
cout << ans << '\n';
}
// else{
// int ans=-1;
// for (auto [u,d] : best[fin]){
// if (!toff[u])ans=max(ans,d);
// }
// cout << ans << '\n';
// }
for (auto u : wej)toff[u]=false;
wej.clear();
}
}
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