#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()
#define int long long
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
const int inf = 1e18;
const int LG = 17;
const int N = 1e5 + 1;
int up[LG][N] = {}, d[N];
int up_min[LG][N];
int t = 0;
vector<vector<pair<int,int>>> gr;
void dfs(int v, int p) {
    for (int l = 1; l < LG; l++) {
        up[l][v] = up[l - 1][up[l - 1][v]];
        up_min[l][v] = min(up_min[l - 1][v], up_min[l - 1][up[l - 1][v]]);
    }
    if (p == -1) {
        d[v] = 0;
        up[0][v] = 0;
        up_min[0][v] = inf;
    }
    else {
        d[v] = d[p] + 1;
    }
    for (auto&& [u, w] : gr[v]) {
        if (u != p) {
            up[0][u] = v;
            up_min[0][u] = w;
            dfs(u, v);
        }
    }
}
int get_mn(int a, int b) {
    int ans = inf;
    if (a == b)return a;
    if (d[b] > d[a])swap(a, b);
    for (int i = LG - 1; i >= 0; i--) {
        if (d[up[i][a]] >= d[b]) {
            ans = min(ans, up_min[i][a]);
            a = up[i][a];
        }
    }
    if (a == b) return ans;
    for (int i = LG - 1; i >= 0; i--) {
        if (up[i][a] != up[i][b]) {
            ans = min(ans, min(up_min[i][a], up_min[i][b]));
            a = up[i][a], b = up[i][b];
        }
    }
    return min(ans, min(up_min[0][b],up_min[0][a]));
}
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);
    int n, m; cin >> n;
    gr.resize(n);
    for (int i = 1; i < n; i++) {
        int v, w; cin >> v >> w;
        v--;
        gr[v].push_back({ i,w });
        gr[i].push_back({ v,w });
    }
    for (int i = 0; i < LG; i++) {
        for (int j = 0; j < n; j++) {
            up_min[i][j] = inf;
        }
    }
    dfs(0, -1);
    int q; cin >> q;
    for (int i = 0; i < q; i++) {
        int a, b;
        cin >> a >> b;
        a--, b--;
        cout << get_mn(a, b) << '\n';
    }
}