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 pb push_back
#define fi first
#define se second
#define ll long long
const int MAX=1e5+10, S=1<<19, L=19;
int n, q, a, b, mini[MAX], root, nr[MAX];
vector<int>g[MAX];
int pre[MAX], maxiPre[MAX], jump[MAX][L+1], czas=1;
void dfs1(int v, int oj){
mini[v]=v;
pre[v]=czas++;
maxiPre[v]=pre[v];
jump[v][0]=oj;
for(int i=1; i<=L; i++)
jump[v][i]=jump[jump[v][i-1]][i-1];
for(auto s:g[v]){
if(s!=oj){
dfs1(s, v);
mini[v]=min(mini[v], mini[s]);
maxiPre[v]=max(maxiPre[v], maxiPre[s]);
}
}
}
int akt=1;
void dfs2(int v, int oj){
int aktMini=MAX;
set<pair<int,int>>x;
for(auto s: g[v])
if(s!=oj)
x.insert({mini[s], s});
for(set<pair<int,int>>::iterator it=x.begin(); it!=x.end(); it++)
dfs2((*it).se, v);
nr[v]=akt++;
}
int t[2*S+10], pch[2*S+10];
void pchaj(int v, int pocz, int kon){
t[v*2]+=(kon-pocz+1)/2*pch[v], t[v*2+1]+=(kon-pocz+1)/2*pch[v], pch[2*v]+=pch[v], pch[2*v+1]+=pch[v];
pch[v]=0;
}
void Insert(int v, int pocz, int kon, int a, int b, int w){
if(pocz>b||kon<a) return;
if(a<=pocz&&kon<=b){
pch[v]+=w;
t[v]+=(kon-pocz+1)*w;
return;
}
pchaj(v, pocz, kon);
Insert(v*2, pocz, (pocz+kon)/2, a, b, w);
Insert(v*2+1, (pocz+kon)/2+1, kon, a, b, w);
t[v]=t[v*2]+t[v*2+1];
}
int Query(int v, int pocz, int kon, int a){
if(kon<a||pocz>a) return 0;
if(pocz==kon && kon==a) return t[v];
pchaj(v, pocz, kon);
return (Query(v*2, pocz, (pocz+kon)/2, a)+Query(v*2+1, (pocz+kon)/2+1, kon, a));
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0), cout.tie(0);
cin>>n>>q;
for(int i=1; i<=n; i++){
cin>>a;
if(!a)
root=i;
else
g[i].pb(a), g[a].pb(i);
}
dfs1(root, root);
dfs2(root, root);
set<pair<int,int>>kol;
for(int i=1; i<=n; i++)
kol.insert({nr[i], i});
while(q--){
cin>>a>>b;
if(a==1){
while(b--){
int v=(*kol.begin()).se;
kol.erase(kol.begin());
if(pre[v]+1<=maxiPre[v])
Insert(1, 0, S-1, pre[v]+1, maxiPre[v], 1);
if(!b)
cout<<v<<"\n";
}
/* for(int i=1; i<=n; i++)
cout<<i<<" "<<pre[i]<<" "<<Query(1, 0, S-1, pre[i])<<"x\n";;
cout<<"\n";
*/ }
else{
int wyn=Query(1, 0, S-1, pre[b]);
cout<<wyn<<"\n";
int l=0, v=b;
while(wyn){
if(wyn%2)
v=jump[v][l];
wyn/=2, l++;
}
Insert(1, 0, S-1, pre[v]+1, maxiPre[v], -1);
kol.insert({nr[v], v});
}
}
}
컴파일 시 표준 에러 (stderr) 메시지
ballmachine.cpp: In function 'void dfs2(int, int)':
ballmachine.cpp:28:9: warning: unused variable 'aktMini' [-Wunused-variable]
28 | int aktMini=MAX;
| ^~~~~~~
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