#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n, q;
    cin >> n >> q;
    vector<int> tp;
    vector<vector<int>> g(n);
    for (int i = 0; i < n; i++)
    {
        int j;
        cin >> j;
        if (j == -1)
            tp.push_back(i);
        else
            g[j - 1].push_back(i);
    }

    vector<int> tin(n), tout(n);
    int timer = 0;
    function<void(int)> dfs = [&](int v)
    {
        tin[v] = timer++;
        for (int to : g[v])
            dfs(to);
        tout[v] = timer++;
    };

    for (int v : tp)
        dfs(v);

    while (q--)
    {
        int u, v;
        cin >> u >> v;
        u--, v--;
        if (tin[u] < tin[v] && tout[u] > tout[v])
            cout << "Yes\n";
        else
            cout << "No\n";
    }
}