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;
#define N 100005
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
int t[4*N],cnt[N],dep[N],head[N],heavy[N],p[N],id[N],out[N],last[N],sz;
vector<int> v,temp,ans;
bitset<N> vis;
vector<pair<int,int>> g[N];
void dfs(int s,int f){
int ma=0;
cnt[s]=1;
dep[s]=dep[f]+1;
heavy[s]=-1;
p[s]=f;
for(auto [x,i]:g[s]){
if(x==f)continue;
out[x]=i;
dfs(x,s);
cnt[s]+=cnt[x];
if(cnt[x]>ma)ma=cnt[x],heavy[s]=x;
}
}
void hld(int s,int f,int h){
head[s]=h;
id[s]=++sz;
if(heavy[s]!=-1)hld(heavy[s],s,h);
for(auto [x,i]:g[s]){
if(x==f||x==heavy[s])continue;
hld(x,s,x);
}
return ;
}
int lca(int a,int b){
while(head[a]!=head[b]){
if(dep[head[a]]>dep[head[b]])a=p[head[a]];
else b=p[head[b]];
}
if(dep[a]<dep[b])return a;
else return b;
}
void push(int x,int l,int r){
if(t[x]&&l!=r){
t[x*2]+=t[x];
t[x*2+1]+=t[x];
t[x]=0;
}
}
void upd(int x,int l,int r,int ll,int rr){
push(x,l,r);
if(l>rr||ll>r||ll>rr)return ;
if(ll<=l&&r<=rr){
t[x]++;
push(x,l,r);
return ;
}
int mid=(l+r)/2;
upd(x*2,l,mid,ll,rr);
upd(x*2+1,mid+1,r,ll,rr);
}
void update(int a,int l){
while(head[a]!=head[l]){
upd(1,1,sz,max(id[head[a]],last[head[a]]+1),id[a]);
last[head[a]]=max(last[head[a]],id[a]);
if(!vis[head[a]])vis[head[a]]=true,temp.push_back(head[a]);
a=p[head[a]];
}
if(a!=l){
upd(1,1,sz,max(id[l]+1,last[head[a]]+1),id[a]);
last[head[a]]=max(last[head[a]],id[a]);
if(!vis[head[a]])vis[head[a]]=true,temp.push_back(head[a]);
}
}
int sol(int x,int l,int r,int p){
push(x,l,r);
if(l>p||p>r)return 0;
if(l==r)return t[x];
int mid=(l+r)/2;
return sol(x*2,l,mid,p)+sol(x*2+1,mid+1,r,p);
}
int main(){
int n,m,k,i,a,b,t,x,l;
scanf("%d %d %d",&n,&m,&k);
for(i=1;i<n;i++){
scanf("%d %d",&a,&b);
g[a].push_back({b,i});
g[b].push_back({a,i});
}
dfs(1,0);
hld(1,0,1);
while(m--){
scanf("%d",&t);
for(i=1;i<=t;i++)scanf("%d",&x),v.push_back(x);
l=v[0];
for(i=1;i<v.size();i++)l=lca(l,v[i]);
for(auto x:v)update(x,l);
for(auto x:temp)last[x]=0,vis[x]=false;
v.clear();
}
for(i=1;i<=n;i++)if(sol(1,1,n,id[i])>=k)ans.push_back(out[i]);
sort(ans.begin(),ans.end());
printf("%d\n",ans.size());
for(auto x:ans)printf("%d ",x);
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
railway.cpp: In function 'int main()':
railway.cpp:104:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
104 | for(i=1;i<v.size();i++)l=lca(l,v[i]);
| ~^~~~~~~~~
railway.cpp:111:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
111 | printf("%d\n",ans.size());
| ~^ ~~~~~~~~~~
| | |
| int std::vector<int>::size_type {aka long unsigned int}
| %ld
railway.cpp:92:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
92 | scanf("%d %d %d",&n,&m,&k);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~
railway.cpp:94:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
94 | scanf("%d %d",&a,&b);
| ~~~~~^~~~~~~~~~~~~~~
railway.cpp:101:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
101 | scanf("%d",&t);
| ~~~~~^~~~~~~~~
railway.cpp:102:31: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
102 | for(i=1;i<=t;i++)scanf("%d",&x),v.push_back(x);
| ~~~~~^~~~~~~~~
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