#include "testlib.h"
#include <iostream>

using namespace std;

constexpr int MIN_T = 0;
constexpr int MAX_T = 1;
constexpr int MIN_N = 1;
constexpr int MAX_N = 2000;
constexpr int MIN_M = 0;
constexpr int MAX_M = 2000;
constexpr int MIN_W = 1;
constexpr int MAX_W = 1000000000;

int main(int argc, char *argv[]) {
    registerValidation(argc, argv);
    int T = inf.readInt(MIN_T, MAX_T, "T");
    inf.readEoln();
    int N = inf.readInt(MIN_N, MAX_N, "N");
    inf.readSpace();
    int M = inf.readInt(MIN_M, MAX_M, "M");
    inf.readEoln();

    vector<int> u(M),v(M),w(M);
    set<pair<int,int>> st;
    for(int i = 0; i < M; ++i) {
        u[i] = inf.readInt(1, N, format("u_%d", i+1));
        inf.readSpace();
        v[i] = inf.readInt(1, N, format("v_%d", i+1));
        inf.readSpace();
        w[i] = inf.readInt(MIN_W, MAX_W, format("w_%d", i+1));
        inf.readEoln();

        ensure(u[i]!=v[i]);
        ensure(st.count({u[i],v[i]})==0);
        ensure(st.count({v[i],u[i]})==0);

        st.insert({u[i],v[i]});
        st.insert({v[i],u[i]});
    }    
    inf.readEof();
    return 0;
}