#include <vector>
#include <iostream>
#include <fstream>

std::vector <std::vector<int>> g, gr;
std::vector<char> used;
std::vector<int> order, component;

void dfs1 (int v) {
    used[v] = true;
    for (size_t i=0; i<g[v].size(); ++i)
        if (!used[ g[v][i] ])
            dfs1 (g[v][i]);
    order.push_back (v);
}

void dfs2 (int v) {
    used[v] = true;
    component.push_back (v);
    for (size_t i=0; i<gr[v].size(); ++i)
        if (!used[ gr[v][i] ])
            dfs2 (gr[v][i]);
}

int main() {
    for (int ii = 1; ii < 2; ii++) {
//        std::ifstream cin(std::to_string(ii).c_str());
        int n, m, q;
        std::cin >> n >> m >> q;

        g.resize(n);
        gr.resize(n);

        for (int i = 0; i < m; i++) {
            int a, b;
            std::cin >> a >> b;
            a--;
            b--;
            g[a].push_back(b);
            gr[b].push_back(a);
        }

        used.assign(n, false);
        for (int i = 0; i < n; ++i) {
            if (!used[i]) {
                dfs1(i);
            }
        }
        used.assign(n, false);

        std::vector<std::vector<int>> components;

        for (int i = 0; i < n; ++i) {
            int v = order[n - 1 - i];
            if (!used[v]) {
                dfs2(v);
                components.emplace_back(component);
                component.clear();
            }
        }

        std::vector<int> ver(n, 0);
        for (int i = 0; i < components.size(); i++) {
            for (auto j: components[i]) {
                ver[j] = i;
            }
        }

        std::vector<bool> answer(q);
        for (int j = 0; j < q; j++) {
            int a, b;
            std::cin >> a >> b;
            a--;
            b--;
            answer[j] = (ver[a] == ver[b]);
        }
//        std::ofstream cout((std::to_string(ii) + ".a").c_str());

        for (auto j: answer) {
            if (j) {
                std::cout << "YES\n";
            } else {
                std::cout << "NO\n";
            }
        }
    }
}