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>
#define ll int
#define pll pair<ll, ll>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ld long double
#define sz(a) ((ll)(a).size())
using namespace std;
const ll maxn=100005, s=200;
ll deg[maxn], seen[maxn];
vector <pll> best[maxn];
vector <ll> A[maxn], At[maxn];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
ll n, m, q; cin >> n >> m >> q;
for (ll i=1; i<=m; i++)
{
ll u, v; cin >> u >> v;
A[u].pb(v), At[v].pb(u), deg[v]++;
}
queue <ll> Q;
for (ll i=1; i<=n; i++)
if (!deg[i]) Q.push(i);
while (sz(Q))
{
ll u=Q.front(); Q.pop();
if (sz(At[u]))
{
vector <pll> val;
best[u]=best[At[u][0]];
for (ll i=1; i<sz(At[u]); i++)
{
ll v=At[u][i];
for (ll p1=0, p2=0; p1<sz(best[u]) || p2<sz(best[v]);)
{
if (p1==sz(best[u]) || (p2<sz(best[v]) && best[u][p1]<best[v][p2]))
val.pb(best[v][p2]), p2++;
else val.pb(best[u][p1]), p1++;
}
best[u].clear();
for (auto [x, v]:val)
if (!seen[v])
{
seen[v]=1, best[u].pb({x, v});
if (sz(best[u])==s) break;
}
for (auto [x, v]:best[u]) seen[v]=0;
val.clear();
}
}
for (auto &[x, v]:best[u]) x++;
if (sz(best[u])<s) best[u].pb({0, u});
for (ll v:A[u])
{
deg[v]--;
if (!deg[v]) Q.push(v);
}
}
for (ll i=1; i<=q; i++)
{
ll X, x, ans=-1; cin >> X >> x;
vector <ll> a(x);
for (ll &i:a) cin >> i;
if (x>=s)
{
queue <ll> q;
vector <ll> dp(n+5, 0), deg(n+5, 0);
for (ll i=1; i<=n; i++) deg[i]=sz(At[i]), !deg[i]?q.push(i),0:0;
for (ll i:a) dp[i]=-1e9;
while (sz(q))
{
ll u=q.front(); q.pop();
for (ll v:At[u])
dp[u]=max(dp[u], dp[v]+1);
for (ll v:A[u])
{
deg[v]--;
if (!deg[v]) q.push(v);
}
}
if (dp[X]>=0) ans=dp[X];
}
else
{
for (ll j:a) seen[j]=1;
for (auto [x, v]:best[X])
if (!seen[v]) {ans=x; break;}
for (ll j:a) seen[j]=0;
}
cout << ans << "\n";
}
}
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