Two hop

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    int t;
    cin >> t;
    while (t--) {
        int n, m, q;
        cin >> n >> m >> q;
        vector< vector<int> > matrix(n + 1, vector<int>(n + 1, 0));
        
        while (m--) {
            int u, v;
            cin >> u >> v;
            matrix[u][v] = 1;
            matrix[v][u] = 1;
        }
        
        while (q--) {
            int u, v;
            cin >> u >> v;
            bool fi = false;
            for (int i = 0; i < matrix[u].size(); ++i) {
                if (matrix[u][i] == 1 && matrix[i][v] == 1) {
                    fi = true;
                    cout << "Y\n";
                    break;
                }
            }
            if (!fi) {
                cout << "N\n";
            }
        }
    }
    return 0;
}