#include <fstream>
#include <vector>
using namespace std;

ifstream cin("lca.in");
ofstream cout("lca.out");

int n, m, x, y;
int nivel[100001];
int v[100001];


int lca(int x,int y){
    while(x!=y){
        if(nivel[x]>nivel[y]){
            x=v[x];
        }else{
            y=v[y];
        }
    }
    return x;
}

int main()
{
    cin>>n>>m;
    for(int i=2;i<=n;i++){
        cin >> v[i];
        nivel[i]=nivel[v[i]]+1;
    }
    for(int i=0;i<m;i++){
        cin>>x>>y;
        cout<<lca(x,y)<<"\n";
    }
}