#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

ifstream fin ("lca.in");
ofstream fout ("lca.out");

int N, M;
int TT[100005], Level[100005];

vector <int> G[100005];



int LCA(int x, int y)
{
    if (Level[y]>Level[x])
        swap(x, y);

    while(Level[x]!=Level[y])
        x=TT[x];

    while (x!=y)
    {
        x=TT[x];
        y=TT[y];
    }

    return x;
}

void DFS(int nod)
{
    for (int i=0; i<(int)G[nod].size(); i++)
    {
        Level[G[nod][i]]=Level[nod]+1;
        DFS(G[nod][i]);
    }
}

int main()
{
    fin >> N >> M;
    for (int i=2; i<=N; i++)
    {
        fin >> TT[i];
        G[TT[i]].push_back(i);
    }
    DFS(1);
    for (int i=1; i<=M; i++)
    {
        int x, y;
        fin >> x >> y;
        fout << LCA(x, y) << "\n";
    }
    return 0;
}