이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
void fast(){ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);}
const int SQR=300;
int main(){
fast();
int n, m, q; cin>>n>>m>>q;
vector<int> v[n+1];
for(int i=1; i<=m; i++){
int x, y; cin>>x>>y;
v[y].push_back(x);
}
vector<pair<int,int>> l[n+1]; //longest paths
vector<int> dp(n+1), vis(n+1), block(n+1), dist(n+1), st;
for(int i=1; i<=n; i++){
l[i].push_back({0, i});
st.clear();
for(auto j:v[i]){
for(auto [d, x]:l[j]){
if(vis[x]==i){
dist[x]=max(dist[x], d+1);
}
else{
dist[x]=d+1;
vis[x]=i;
st.push_back(x);
}
}
}
while(!st.empty()){
int u=st.back(); st.pop_back();
l[i].push_back({dist[u], u});
}
sort(l[i].begin(), l[i].end(), greater<pair<int,int>>());
if((int)l[i].size()>SQR) l[i].erase(l[i].begin()+SQR, l[i].end());
}
while(q--){
int t, y; cin>>t>>y;
for(int i=1; i<=y; i++){
int x; cin>>x;
block[x]=q;
}
if(y<SQR){
int ans=-1;
for(auto [d, x]:l[t]){
if(block[x]!=q){
ans=d;
break;
}
}
cout<<ans<<'\n';
}
else{
for(int i=1; i<=n; i++) dp[i]=-1;
for(int i=1; i<=n; i++){
if(block[i]!=q){
dp[i]=0;
for(auto j:v[i]){
if(dp[j]!=-1) dp[i]=max(dp[i], dp[j]+1);
}
}
}
cout<<dp[t]<<'\n';
}
}
}
/*
const int N=1e6, SQR=1e3;
int l[N+1], r[N+1], id[N+1];
bool cmp(int x, int y){
if(l[x]/SQR!=l[y]/SQR) return l[x]/SQR<l[y]/SQR;
if((l[x]/SQR)&1) return r[x]<r[y];
return r[x]>r[y];
}
int main(){
fast();
int n; cin>>n;
for(int i=1; i<=n; i++){
cin>>l[i]>>r[i];
id[i]=i;
}
sort(id+1, id+n+1, cmp);
// for(int i=1; i<=n; i++){
// cout<<l[id[i]]<<' '<<r[id[i]]<<'\n';
// }
// int ans=0;
// for(int i=2; i<=n; i++){
// int j=id[i], k=id[i-1];
// ans+=abs(l[j]-l[k])+abs(r[j]-r[k]);
// }
// cout<<ans;
for(int i=1; i<=n; i++) cout<<id[i]<<' ';
}
*/
/*
const int N=2e5, SQR=300;
int l[N+1], r[N+1], id[N+1];
bool cmp(int x, int y){
if(l[x]/SQR!=l[y]/SQR) return l[x]/SQR<l[y]/SQR;
return r[x]<r[y];
}
int now, a[N+1];
map<int,int> mp;
void add(int x){
mp[a[x]]++;
if(mp[a[x]]==1) now++;
}
void del(int x){
mp[a[x]]--;
if(mp[a[x]]==0) now--;
}
int main(){
fast();
int n, q; cin>>n>>q;
for(int i=1; i<=n; i++) cin>>a[i];
for(int i=1; i<=q; i++){
cin>>l[i]>>r[i];
id[i]=i;
}
sort(id+1, id+q+1);
int ki=1, ka=0, ans[q+1];
for(int i=1; i<=q; i++){
int j=id[i];
while(ki>l[j]){
ki--;
add(ki);
}
while(ka<r[j]){
ka++;
add(ka);
}
while(ki<l[j]){
del(ki);
ki++;
}
while(ka>r[j]){
del(ka);
ka--;
}
ans[j]=now;
}
for(int i=1; i<=q; i++) cout<<ans[i]<<'\n';
}
*/
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