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

using namespace std;

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


vector <int> l[100001];

void form(int father, int node){
    for(int i:l[father]){
        l[node].push_back(i);
    }
}

void rezolv(int a,int b){
    for(int i:l[a]){
        for(int j:l[b]){
            if(i<j)
                break;
            if(i==j){
                fout<<i<<endl;
                return;
            }
        }
            
    }
        
                
}

int main() {
    int n,m,a,x,y;
    fin>>n>>m;
    l[1].push_back(1);
    for(int i=2;i<=n;i++){
        fin>>a;
        l[i].push_back(i);
        form(a,i);
    }
    for(int i=1;i<=m;i++){
        fin>>x>>y;
        rezolv(x,y);
    }
        
    return 0;
}