#define _CRT_SECURE_NO_WARNINGS
#define debug(l) cerr<<#l<<' '<<l<<'\n';
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()
typedef int ll;
typedef pair<ll, ll> pll;
typedef long double ld;
struct Node {
    unordered_map<ll, ll> colors;
};
struct Node_help {
    vector<ll> colors;
};
vector<Node_help> centroid_build_vertex;
vector<Node> centroid_vertex;
vector<ll> clr;
vector<vector<ll>> g;
const ll LG = 17;
vector<vector<ll>> up;
vector<ll> d;

void dfs(ll v, ll p) {
    if (p == -1) {
        d[v] = 0;
        up[0][v] = 0;
    }
    else {
        d[v] = d[p] + 1;
    }
    for (ll l = 1; l < LG; l++) {
        up[l][v] = up[l - 1][up[l - 1][v]];
    }
    for (ll& u : g[v]) {
        if (u != p) {
            up[0][u] = v;
            dfs(u, v);
        }
    }
}
ll get_lca(ll a, ll b) {
    if (a == b)return a;
    if (d[b] > d[a])swap(a, b);
    for (ll i = LG - 1; i >= 0; i--) {
        if (d[up[i][a]] >= d[b]) a = up[i][a];
    }
    if (a == b) return a;
    for (ll i = LG - 1; i >= 0; i--) {
        if (up[i][a] != up[i][b]) a = up[i][a], b = up[i][b];
    }
    return up[0][a];
}
ll get_dist(ll a, ll b) {
    ll lca = get_lca(a, b);
    return d[b] + d[a] - 2 * d[lca];
}
struct Centroid_decomposition {
    vector<vector<ll>> gr;
    vector<ll> tree, siz;
    ll root = -1;
    Centroid_decomposition(ll n) {
        tree.resize(n, -2);
        siz.resize(n);
    }
    void sizes(ll v, ll p) {
        siz[v] = 1;
        for (ll& u : g[v]) {
            if (u != p && tree[u] == -2) {
                sizes(u, v);
                siz[v] += siz[u];
            }
        }
    }
    ll centroid(ll v, ll p, ll s) {
        for (ll& u : g[v]) {
            if (u != p && tree[u] == -2 && siz[u] > s / 2) {
                return centroid(u, v, s);
            }
        }
        return v;
    }
    void build(ll v, ll p) {
        sizes(v, -1);
        tree[v] = p;
        if (p != -1) {
            gr[v].push_back(p);
            gr[p].push_back(v);
        }
        centroid_build_vertex[v].colors.push_back({ v });
        for (ll& u : g[v]) {
            if (tree[u]==-2) {
                build(centroid(u, -1, siz[u]), v);
            }
        }
        for (ll& u : gr[v]) {
            if (u != p) {
                if ((ll)centroid_build_vertex[v].colors.size() < centroid_build_vertex[u].colors.size()) {
                    centroid_build_vertex[v].colors.swap(centroid_build_vertex[u].colors);
                }
                for (ll& i : centroid_build_vertex[u].colors) {
                    centroid_build_vertex[v].colors.push_back(i);
                }
                centroid_build_vertex[u].colors.clear();
            }
        }
        gr[v].clear();
        for (ll& i : centroid_build_vertex[v].colors) {
            ll x = get_dist(i, v);
            if (centroid_vertex[v].colors.find(clr[i]) == centroid_vertex[v].colors.end()) {
                centroid_vertex[v].colors[clr[i]] = x;
                continue;
            }
            centroid_vertex[v].colors[clr[i]] = min(centroid_vertex[v].colors[clr[i]], x);
        }
    }
    void build_tree() {
        ll v = 0;
        sizes(v, -1);
        gr.resize(tree.size());
        centroid_build_vertex.resize(tree.size());
        centroid_vertex.resize(tree.size());
        build(centroid(v, -1, siz[v]), -1);
        gr.clear();
        siz.clear();
    }
};
signed main() {
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll n;
    cin >> n;
    g.resize(n);
    clr.resize(n);
    for (ll i = 0; i < n - 1; i++) {
        ll x;
        cin >> x;
        g[x].push_back(i + 1);
        g[i + 1].push_back(x);
    }
    for (ll i = 0; i < n; i++) {
        cin >> clr[i];
    }
    up.resize(LG, vector<ll>(n));
    d.resize(n);
    dfs(0, -1);
    centroid_vertex.resize(n);
    centroid_build_vertex.resize(n);
    Centroid_decomposition U(n);
    U.build_tree();
    g.clear();
    centroid_build_vertex.clear();
    ll q;
    cin >> q;
    while (q--) {
        ll v, c;
        cin >> v >> c;
        ll it = v;
        ll ans = INT_MAX;
        while (it != -1) {
            auto& clrs = centroid_vertex[it].colors;
            auto it_c = clrs.find(c);
            if (it_c != clrs.end()) {
                ans = min(ans, (it_c->second) + get_dist(v, it));
            }
            it = U.tree[it];
        }
        if (ans == INT_MAX) {
            cout << -1 << ' ';
        }
        else {
            cout << ans << ' ';
        }
    }
}