#include <cstdio>
#include <vector>
#include <algorithm>
#define max(a, b) (a > b ? a : b)
#define NMAX 100005

using namespace std;

int n, m, k;
vector<int>v[NMAX];
int H[NMAX << 1], Lv[NMAX << 1], first[NMAX], lg[NMAX];
int R[NMAX << 2][25];

void dfs(int nod,int niv)
{
    H[++k]=nod;
    Lv[k]=niv;
    first[nod]=k;
    for(int it = 0; it < v[nod].size(); ++it)
    {
        dfs(v[nod][it],niv+1);
        H[++k]=nod;
        Lv[k]=niv;
    }
}

void citire()
{
    int x;
    freopen("lca.in", "r", stdin);
    scanf("%d%d",&n,&m);
    for(int i = 2; i <= n; ++i)
    {
        scanf("%d",&x);
        v[x].push_back(i);
    }
    dfs(1,0);
}

void rmq()
{
    for(int i = 2; i <= k; ++i)
        lg[i] = lg[i/2] + 1;
    for(int i = 1; i <= k; ++i)
        R[0][i]=i;

    for(int i = 1; (1 << i) < k; ++i)
        for(int j = 1; j <= k - (1 << i); ++j)
        {
            int l = 1 << (i - 1);

            R[i][j] = R[i-1][j];
            if(Lv[R[i-1][j + l]] < Lv[R[i][j]])
                R[i][j] = R[i-1][j + l];
        }
}

int lca(int x, int y)
{
    int dif, l, sol, sh;
    int a = first[x], b = first[y];
    if(a > b) swap(a, b);
    dif = b - a + 1;
    l = lg[dif];
    sol = R[l][a];
    sh = dif - (1 << l);
    if(Lv[sol] > Lv[R[l][a + sh]])
        sol = R[l][a + sh];
    return H[sol];
}

void query()
{
    int x,y;
    freopen("lca.out", "w",stdout);
    for(int i = 1; i <= m; ++i)
    {
        scanf("%d%d",&x,&y);
        printf("%d\n",lca(x,y));
    }
}

int main()
{
    citire();
    rmq();
    query();
    return 0;
}