#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";
        }
    }