#include <bits/stdc++.h>

#define NMAX 100005

using namespace std;

ifstream f("lca.in");
ofstream g("lca.out");

int level[NMAX], dad[NMAX], N, M, node1, node2;

void dfs(int node, int _level) {
    level[node] = _level;
    for (int i = 1; i <= N; ++i) {
        if (dad[i] == node) {
            dfs(i, _level + 1);
            break;
        }
    }
}

int main() {
    f >> N >> M;
    for (int i = 2; i <= N; ++i) {
        f >> dad[i];
    }

    dfs(1, 0);

    for (int i = 0; i < M; ++i) {
        f >> node1 >> node2;
        while (node1 != node2) {
            if (level[node1] > level[node2]) {
                node1 = dad[node1];
            } else {
                node2 = dad[node2];
            }
        }

        g << node1 << '\n';
    }

    f.close();
    g.close();
    return 0;
}