Language: C++

/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author
 */

// doot diddly donger cuckerino Hahahahahah

#include <bits/stdc++.h>

using namespace std;

typedef long long LL;
typedef long double LD;
typedef unsigned int UINT;
typedef unsigned long long ULL;
typedef pair<int, int> PII;
typedef pair<string, int> PSI;
typedef pair<LL, LL> PLL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef vector<bool> VB;
typedef vector<PII> VPII;
typedef vector<PLL> VPLL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef tuple<int, int, int> TPL;
typedef priority_queue<int> pqueue;
typedef priority_queue<int, VI, greater<>> pdqueue;

#define sim             template<class T
#define MP              make_pair
#define MT              make_tuple
#define PB              push_back
#define EB              emplace_back
#define F               first
#define S               second
#define ALL(a)          std::begin(a), std::end(a)
#define Sort(X)         sort(ALL(X))
#define UNIQUE(X)       Sort(X); (X).erase(unique(ALL(X)),(X).end())
#define SZ(x)           (int)(x).size()
#define IN_REP          int _t; cin >> _t ; while(_t--)
#define IOS             ios::sync_with_stdio(false);cin.tie(NULL)
#define FOR(i, a, b)    for(int i=(a);i<(b);i++)
#define REP(i, n)       FOR(i,0,n)
#define FORR(i, n)      for(int i=(n);i>=0;i--)
#define EPS             (LD) 1e-9
#define MOD             (LL)(1e9+ 7)
#define cerr2(x,y)      cerr << (x) << " " << (y) << endl;
#define cout2(x,y)      cout << (x) << " " << (y) << endl;
const LD PI = acos(-1);
sim>T gcd(T x, T y) {return (y==0)?x:gcd(y, x % y);}
sim>void mini(T &a, T b) { a = min(a, b); }
sim>void maxi(T &a, T b) { a = max(a, b); }
sim>inline void add(T &x, T y) {x += y;if (x >= MOD) x -= MOD;}
sim>inline void sub(T &x, T y) {x -= y;if (x < 0) x += MOD;}
sim>inline T mul(T a, T b) {LL x = (long long) a * b;x %= MOD;return x;}
sim>inline T power(T base, T exp) {T result = 1; while (exp) {if (exp & 1)result *= base;exp >>= 1;base *= base;}return result;}
sim>inline T power(T a, T b, T mod) {T res = 1;while (b > 0) {if (b & 1) { res = mul(res, a); }a = mul(a, a);b >>= 1;}return res%mod;}
sim>inline T modInverse(T n, T p) { return power(n, p - 2, p)%p; }
sim, class U>string to_string(pair<T, U> p) {return "" + to_string(p.F) + " " + to_string(p.S) + "";}


int n, m;
VVI vec;
VI x, y, z;
VB vis;
int res = 0;
bool ok;

void dfs(int j) {
    if (!vis[j]) {
        vis[j] = true;
        for (int xx : vec[j]) {
            dfs(xx);
        }
    }
}

class E1Or2 {
public:
    void solve(std::istream &cin, std::ostream &cout) {
        cin >> n >> m;
        vec.resize(n);
        x.resize(n);
        y.resize(n);
        z.resize(n);
        vis.resize(n, false);
        REP(i, m) {
            cin >> x[i] >> y[i] >> z[i];
            x[i]--;
            y[i]--;
            vec[x[i]].PB(y[i]);
            vec[y[i]].PB(x[i]);
        }
        for (int j = 0; j < n; ++j) {
            if (!vis[j]) {
//                cerr << j << endl;
                res++;
                dfs(j);
            }
        }
        cout << res << endl;
    }
};


int main() {
    IOS;
	E1Or2 solver;
	std::istream& in(std::cin);
	std::ostream& out(std::cout);
	E1Or2::solve(in,out);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:114:21: error: cannot call member function 'void E1Or2::solve(std::istream&, std::ostream&)' without object
  114 |         E1Or2::solve(in,out);
      |         ~~~~~~~~~~~~^~~~~~~~