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#include <bits/stdc++.h>
using namespace std;
int v[100005],v2[100005],level[100005];
vector <int> V[100005];
void DFS(int k,int k1,int niv)
{
level[k]=niv;
v2[k]=k1;
for(auto x:V[k])
{
DFS(x,k,niv+1);
}
}
int main()
{
ifstream fin("lca.in");
ofstream fout("lca.out");
ios_base::sync_with_stdio(false);
fin.tie(0);
fout.tie(0);
int n,Q,a,b;
fin>>n>>Q;
for(int i=2;i<=n;i++)
{
fin>>v[i];
V[v[i]].push_back(i);
}
DFS(1,1,0);
for(int i=1;i<=Q;i++)
{
fin>>a>>b;
while(v2[a]!=v2[b])
{
if(level[a]>level[b])
a=v2[a];
else
b=v2[b];
}
while(a!=b)
{
if(level[a]>level[b])
a=v[a];
else
b=v[b];
}
fout<<a<<'\n';
}
return 0;
}