#include <bits/stdc++.h>

using namespace std;

const int MAXN = 100005;

int anc[MAXN];


int main()
{
    ifstream fin("lca.in");
    ofstream fout("lca.out");
    int n, m;
    fin >> n >> m;
    for(int i = 2; i <= n; ++i)
        fin >> anc[i];
    while(m){
        int x, y;
        fin >> x >> y;
        while(x != y){
            if(x > y) x = anc[x];
            else y = anc[y];
        }
        fout << x << "\n";
        m--;
    }
    return 0;
}