#include <fstream>
#include <vector>

using namespace std;

const int N = 1e5;
const int L = 16;

int t[L+1][N+1], ti[N+1], to[N+1], n, timp, emax[N+1];
vector <int> fii[N+1];

void dfs(int x)
{
    ti[x] = ++timp;
    for (auto y: fii[x])
    {
        dfs(y);
    }
    to[x] = ++timp;
}

bool este_stramos(int x, int y)
{
    return (ti[x] <= ti[y] && to[y] <= to[x]);
}

int lca(int x, int y)
{
    if (este_stramos(x, y))
    {
        return x;
    }
    for (int e = emax[x]; e >= 0; e--)
    {
        if (t[e][x] != 0 && !este_stramos(t[e][x], y))
        {
            x = t[e][x];
        }
    }
    return t[0][x];
}

int main()
{
    ifstream in("lca.in");
    ofstream out("lca.out");
    int nq;
    in >> n >> nq;
    for (int i = 2; i <= n; i++)
    {
        in >> t[0][i];
        fii[t[0][i]].push_back(i);
    }
    for (int e = 1; (1 << e) <= n; e++)
    {
        for (int i = 1; i <= n; i++)
        {
            t[e][i] = t[e-1][t[e-1][i]];
            if (t[e][i] != 0)
            {
                emax[i] = e;
            }
        }
    }
    dfs(1);
    for (int i = 0; i < nq; i++)
    {
        int x, y;
        in >> x >> y;
        out << lca(x, y) << "\n";
    }
    in.close();
    out.close();
    return 0;
}