Submission #674512

#TimeUsernameProblemLanguageResultExecution timeMemory
674512DenkataBitaro’s Party (JOI18_bitaro)C++17
0 / 100
2106 ms181212 KiB
#include<bits/stdc++.h> #define endl '\n' using namespace std; const int crit = 447; int i,j,p,q,n,m,k,Q,queried[100006],t,y,ans,nom[100006],cnt,vr[100006],br; vector <int> v[100006],obr[100006]; vector <int> big; int prec[450][100006]; int durvo[450][400006]; void calc(int u,int d) { prec[nom[i]][u]=max(prec[nom[i]][u],d); for(auto j:obr[u]) calc(j,d+1); } void dfs(int u,int d) { //cout<<u<<" ud "<<d<<endl; if(prec[nom[u]][t]!=-1 && queried[u]!=br) { ans=max(ans,prec[nom[u]][t]+d); return ; } if(nom[u]!=0) return ; if(queried[u]!=br) ans=max(ans,d); for(auto j:obr[u]) { dfs(j,d+1); } } void add_big(int u) { nom[u]=++cnt; } void build(int id,int p=1,int l=1,int r=n) { if(l==r) { durvo[id][p]=prec[id][l]; return ; } build(id,p*2,l,(l+r)/2); build(id,p*2+1,(l+r)/2+1,r); durvo[id][p]=max(durvo[id][p*2],durvo[id][p*2+1]); } void query(int id,int ql,int qr,int p=1,int l=1,int r=n) { if(r<ql || qr<l) return ; if(l>=ql && r<=qr) { ans=max(ans,durvo[id][p]); return ; } query(id,ql,qr,p*2,l,(l+r)/2); query(id,ql,qr,p*2+1,(l+r)/2+1,r); } int main() { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); cin>>n>>m>>Q; memset(prec,-1,sizeof(prec)); for(i=1;i<=m;i++) { cin>>p>>q; v[p].push_back(q); obr[q].push_back(p); } for(i=1;i<=n;i++) { if(obr[i].size()>=crit) { add_big(i); big.push_back(i); calc(i,0); } } for(auto i:big) { build(nom[i]); } while(Q--) { cin>>t; cin>>y; br++; for(i=1;i<=y;i++) { cin>>vr[i]; queried[vr[i]]=br; } ans=-1; if(nom[t]!=0) { ///big int l=1; for(i=1;i<=y;i++) { j=vr[i]-1; if(l<=j) query(nom[t],l,j); l=vr[i]+1; } if(l<=n) query(nom[t],l,n); } else { ///small dfs(t,0); } cout<<ans<<endl; } return 0; }
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