Language: C++

#include <bits/stdc++.h>
#include <random>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
#define double ld
//#define int ll
//#define int __int128
//#define ll __int128
typedef pair<int, int   > pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;
//typedef complex<double> base;

#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < (int)(n); ++i)
#define SZ(a) ((int)((a).size()))
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cerr << (#x) << " = " << (x) << endl;

#ifdef RUS_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif

const double PI = 2 * acos(0.0);
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";

template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}



void smain();

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

#ifdef RUS_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(12) << fixed;
    smain();
#ifdef RUS_HOME
    cout << "\n\n\n\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
    return 0;
}

const int N = 1e6 + 1, oo = 1e9, MOD = 998244353;

int pr[N];
vi g[N];

int kek;
void merge(int a, int b) {
    kek--;
    a = pr[a]; b = pr[b];
    if (g[a].size() < g[b].size())
        swap(a, b);
    for (auto p : g[b]) {
        pr[p] = a;
        g[a].push_back(p);
    }
    g[b].clear();
}


void smain() {

    int n, m, q;
    cin >> n >> m >> q;
    kek = n;
    for (int i = 0; i < n; i++) {
        pr[i] = i;
        g[i].push_back(i);
    }
    vi a(q), b(q);
    vpi d(q);
    for (int i = 0; i < q; i++) {
        cin >> a[i] >> b[i] >> d[i].first;
        d[i].second = i;
    }
    sort(ALL(d));

    for (int i = 0; i < q; i++) {
        if (d[i].first == 0) {
            merge(a[d[i].second], b[d[i].second]);
        } else
            break;
    }
    int y = n - kek, v = kek;
    for (int i = q - 1; i >= 0; i--) {
        if (d[i].first == 1) {
            if (pr[a[d[i].second]] == pr[b[d[i].second]]) {
                cout << "No";
                return;
            } else {
                merge()
            }
        } else
            break;
    }





}

Compiler output:
a.cc: In function 'void smain()':
a.cc:150:22: error: no matching function for call to 'merge()'
  150 |                 merge()
      |                 ~~~~~^~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:4857:5: note: candidate: 'template<class _IIter1, class _IIter2, class _OIter> _OIter std::merge(_IIter1, _IIter1, _IIter2, _IIter2, _OIter)'
 4857 |     merge(_InputIterator1 __first1, _InputIterator1 __last1,
      |     ^~~~~
/usr/include/c++/14/bits/stl_algo.h:4857:5: note:   candidate expects 5 arguments, 0 provided
/usr/include/c++/14/bits/stl_algo.h:4908:5: note: candidate: 'template<class _IIter1, class _IIter2, class _OIter, class _Compare> _OIter std::merge(_IIter1, _IIter1, _IIter2, _IIter2, _OIter, _Compare)'
 4908 |     merge(_InputIterator1 __first1, _InputIterator1 __last1,
      |     ^~~~~
/usr/include/c++/14/bits/stl_algo.h:4908:5: note:   candidate expects 6 arguments, 0 provided
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:412:1: note: candidate: 'template<class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2, class _ForwardIterator, class _Compare> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2> std::merge(_ExecutionPolicy&&, _ForwardIterator1, _ForwardIterator1, _ForwardIterator2, _ForwardIterator2, _ForwardIterator, _Compare)'
  412 | merge(_ExecutionPolicy&& __exec, _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
      | ^~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:412:1: note:   candidate expects 7 arguments, 0 provided
/usr/include/c++/14/pstl/glue_algorithm_defs.h:417:1: note: candidate: 'template<class _ExecutionPolicy, class _ForwardIterator1, class _ForwardIterator2, class _ForwardIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, _ForwardIterator2> std::merge(_ExecutionPolicy&&, _ForwardIterator1, _ForwardIterator1, _ForwardIterator2, _ForwardIterator2, _ForwardIterator)'
  417 | merge(_ExecutionPolicy&& __exec, _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
      | ^~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:417:1: note:   candidate expects 6 arguments, 0 provided
a.cc:107:6: note: candidate: 'void merge(int, int)'
  107 | void merge(int a, int b) {
      |      ^~~~~
a.cc:107:6: note:   candidate expects 2 arguments, 0 provided