#include <iostream> #include <vector> #include <algorithm> typedef long long ll; const int maxn = 5 + 2e5, maxr = 25005; std::vector<int> edges[maxn]; int vert[maxn], tin[maxn], tout[maxn], timer = 0; void dfs(int u) { tin[u] = ++timer; for (int v : edges[u]) dfs(v); tout[u] = timer; } int main() { std::ios::sync_with_stdio(false); std::cin.tie(nullptr), std::cout.tie(nullptr); int n, r, q; std::cin >> n >> r >> q; std::vector<std::vector<int>> reg(r + 1); std::cin >> vert[1]; reg[vert[1]].push_back(1); for (int i = 2; i <= n; i++) { int par; std::cin >> par >> vert[i]; reg[vert[i]].push_back(i); edges[par].push_back(i); } dfs(1); std::vector<std::vector<int>> reg_timer(r + 1); for (int i = 1; i <= r; i++) { std::sort(reg[i].begin(), reg[i].end(), [](int &a, int &b) { return tin[a] < tin[b]; }); reg_timer[i].reserve(reg[i].size()); for (int &v : reg[i]) reg_timer[i].push_back(tin[v]); } while (q--) { int r1, r2; std::cin >> r1 >> r2; ll ans = 0; for (int &u : reg[r1]) { int left = std::lower_bound(reg_timer[r2].begin(), reg_timer[r2].end(), tin[u]) - reg_timer[r2].begin(); int right = std::upper_bound(reg_timer[r2].begin(), reg_timer[r2].end(), tout[u]) - reg_timer[r2].begin(); ans += right - left; } std::cout << ans << std::endl; } }