Submission #56809

#TimeUsernameProblemLanguageResultExecution timeMemory
56809DiuvenBitaro’s Party (JOI18_bitaro)C++11
14 / 100
2045 ms289760 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; const int MX=100010, inf=2e9, BMX=350; int n, m, q, b=300; vector<int> G1[MX], G2[MX]; bool used[MX]; struct bucket { pii X[BMX]; bucket(){ for(int i=1; i<BMX; i++) X[i]={-inf, 0}; } bucket operator + (const bucket& A) const { bucket res; for(int i=1, p1=1, p2=1; i<=b; i++){ while(p1<=b && used[X[p1].second]) p1++; while(p2<=b && used[A.X[p2].second]) p2++; if(p1>b) res.X[i]=A.X[p2++]; else if(p2>b) res.X[i]=X[p1++]; else if(X[p1]<A.X[p2]) res.X[i]=A.X[p2++]; else res.X[i]=X[p1++]; if(res.X[i].second>0) used[res.X[i].second]=true; } for(int i=1; i<=b; i++) used[res.X[i].second]=false; return res; } } V[MX]; bool vis[MX]; void dfs1(int v){ V[v].X[1]={-1,v}; vis[v]=true; for(int x:G2[v]){ if(!vis[x]) dfs1(x); V[v]=V[v]+V[x]; } for(int i=1; i<=b; i++) V[v].X[i].first++; } int D[MX]; bool out[MX]; int dfs2(int v){ int &res=D[v]; if(res!=-1) return res; res = (out[v] ? -inf : 0); for(int x:G2[v]){ res=max(res, dfs2(x)+1); } return res; } int main(){ ios::sync_with_stdio(0); cin.tie(0); cin>>n>>m>>q; for(int i=1; i<=m; i++){ int u, v; cin>>u>>v; G1[u].push_back(v); G2[v].push_back(u); } for(int i=1; i<=n; i++) if(!vis[i]) dfs1(i); for(int i=1; i<=q; i++){ int v, x; cin>>v>>x; vector<int> A; for(int i=1; i<=x; i++){ int a; cin>>a; A.push_back(a); out[a]=true; } int ans=-1; if(x>=b){ fill(D, D+n+1, -1); ans=max(ans, dfs2(v)); } else{ pii *P=V[v].X; for(int i=1; i<=b; i++){ if(!out[P[i].second]){ ans=max(ans, P[i].first); break; } } } cout<<ans<<'\n'; for(int a:A) out[a]=false; } return 0; }
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