#include <bits/stdc++.h>
#define MAX 100100

using namespace std;

ifstream fi("lca.in");
ofstream fo("lca.out");

int lvl[MAX];
int t[MAX];
int n;
int m;

void formare()
{
    fi>>n>>m;

    lvl[1]=1;
    for(int i=1;i<=n-1;i++)
    {
        int x;
        fi>>x;
        t[i+1]=x;
        lvl[i+1]=lvl[x]+1;
    }
}

void lca(int a,int b)
{
  while(t[a]!=t[b])
    {if(lvl[a]>lvl[b])
        a=t[a];
    else
        b=t[b];}

    while(a!=b)
        {if(lvl[a]>lvl[b])
        a=t[a];
    else
        b=t[b];}

    fo<<a<<'\n';
}

int main()
{
    ios_base::sync_with_stdio(false);

    formare();

    for(int i=1;i<=m;i++)
        {int a,b;
        fi>>a>>b;
        lca(a,b);}

    return 0;
}