#include <bits/stdc++.h> using namespace std; #define ll long long #define ii pair<int, int> #define fi first #define se second #define fo(i,a,b) for (int i = (a); i <= (b); ++i) #define fd(i,a,b) for (int i = (a); i >= (b); --i) #define all(x) x.begin(), x.end() #define pb push_back #define maxi(a,b) a=max(a,b) #define mini(a,b) a=min(a,b) #define er(x) cerr << #x << " = " << (x) << '\n' #define siz(x) ((int)(x).size()) #define ve vector #define _ << ' ' << const int N = 1e5+5, inf = 1e9+10, mod = 1e9+7, sq = 100; int n, m, d[N], deg[N]; ve<int> g[N], rg[N]; ve<ii> res[N]; bool kk[N], vis[N]; ve<ii> mer(ve<ii> &a, ve<ii> b) { fo(i,0,siz(b)-1) b[i].fi++; ve<ii> c; c.reserve(min(siz(a)+siz(b),sq)); int i=0, j=0; while (i<siz(a)||j<siz(b)) { if (i==siz(a)) { if (!vis[b[j].se]) c.pb(b[j]), vis[b[j].se]=1; j++; } else if (j==siz(b)) { if (!vis[a[i].se]) c.pb(a[i]), vis[a[i].se]=1; i++; } else if (a[i].fi>b[j].fi) { if (!vis[a[i].se]) c.pb(a[i]), vis[a[i].se]=1; i++; } else { if (!vis[b[j].se]) c.pb(b[j]), vis[b[j].se]=1; j++; } } fo(i,0,siz(a)-1) vis[a[i].se]=0; fo(i,0,siz(b)-1) vis[b[i].se]=0; return c; } ve<int> topo; void init() { fo(i,1,n) res[i].pb({0,i}); queue<int> q; fo(i,1,n) if (deg[i]==0) q.push(i); while (q.size()) { int u = q.front(); q.pop(); topo.pb(u); for (int v:g[u]) { deg[v]--; if (deg[v]==0) q.push(v); } } for (int u:topo) { for (int v:g[u]) { res[v]=mer(res[v],res[u]); } } } int brute(int to) { fo(i,1,n) d[i]=-inf; d[to]=0; fd(i,n-1,0) { int u=topo[i]; for (int v:rg[u]) { maxi(d[v],d[u]+1); } } int mx=-1; fo(i,1,n) if (!kk[i]) maxi(mx,d[i]); return mx; } void solve() { int q; cin >> n >> m >> q; fo(i,1,m) { int u, v; cin >> u >> v; g[u].pb(v); rg[v].pb(u); deg[v]++; } init(); while (q--) { int tt, sz; cin >> tt >> sz; ve<int> busy(sz); fo(i,0,sz-1) cin >> busy[i], kk[busy[i]]=1; if (sz<sq) { int mx=-1; for (auto &p : res[tt]) { if (!kk[p.se]) { maxi(mx,p.fi); break; } } cout << mx << '\n'; } else { cout << brute(tt) << '\n'; } fo(i,0,sz-1) kk[busy[i]]=0; } } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen("a.inp","r")) { freopen("a.inp","r",stdin); freopen("a.out","w",stdout); } solve(); }

bitaro.cpp: In function 'int main()':
bitaro.cpp:115:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         freopen("a.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
bitaro.cpp:116:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  116 |         freopen("a.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~