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Cod sursa(job #568366)
#include<fstream>
#include<vector>
using namespace std;
vector <int> w[250001];
ifstream fi("stramosi.in");
ofstream fo("stramosi.out");
int z,y,i,k,v[250001],a[250001][20],n,m,p,q;
char viz[250001];
void dfs(int x){
viz[x]=1;
k=0;
int j=1;
int y=v[x];
while(y){
a[x][++k]=y;
y=a[y][j++];
}
for(int i=0;i<w[x].size();++i)
if(!viz[w[x][i]]){
dfs(w[x][i]);
}
}
int main() {
fi>>n>>m;
for(i=1;i<=n;++i){
fi>>v[i];
w[v[i]].push_back (i);
}
for(i=1;i<=n;++i)
if(!v[i]){
memset(viz,0,sizeof(viz));
dfs(i);
}
for(i=1;i<=m;++i){
fi>>q>>p;
int y=q;
int ok=1;
while(ok){
int x=2;
int k=2;
if(p==1){
fo<<v[y]<<'\n';
break;
}else if(!p){
fo<<y<<'\n';
break;
}
while(p>=x){
x*=x;
++k;
}
x/=2;
--k;
y=a[y][k];
p-=x;
}
}
fo.close();
fi.close();
return 0;
}