Language: C++

#define _CRT_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <iostream>
#include <string>
#include <vector>
#include <list>
#include <utility>
#include <algorithm>
#include <functional>
#include <cmath>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <iomanip>
#include <sstream>
#include <bitset>
#include <limits>
#include <numeric>
#include <valarray>
#include <fstream>
#include <array>
#include <random>
#include <unordered_set>
#include <unordered_map>

using namespace std;
using uint = uint32_t;
using LL = int64_t;
using ULL = uint64_t;
using PP = pair<LL, LL>;
template <typename T> using PriorityQ = priority_queue<T, vector<T>, greater<T> >;
#define REP(i, a, n) for(LL i = (a), i##_max_ = (n); i < i##_max_; ++i)
#define REM(i, a, n) for(LL i = (LL)(n) - 1, i##_min_ = (a); i >= i##_min_; --i)
#define FLOAT fixed << setprecision(16)
#define SPEEDUP { cin.tie(NULL); ios::sync_with_stdio(false); }
const int INF = 0x3FFFFFFF;
const LL INFLL = 0x3FFFFFFF3FFFFFFF;
const double INFD = 1.0e+308;
const double EPS = 1.0e-9;

void YesNo(bool b) { cout << (b ? "Yes" : "No") << endl; }
void YESNO(bool b) { cout << (b ? "YES" : "NO") << endl; }
template <class T, class U> istream& operator>>(istream& ist, pair<T, U>& right) { return ist >> right.first >> right.second; }
template <class T, class U> ostream& operator<<(ostream& ost, const pair<T, U>& right) { return ost << right.first << ' ' << right.second; }
template <class T, class TCompatible, size_t N> void Fill(T(&dest)[N], const TCompatible& val) { fill(dest, dest + N, val); }
template <class T, class TCompatible, size_t M, size_t N> void Fill(T(&dest)[M][N], const TCompatible& val) { for (int i = 0; i < M; ++i) Fill(dest[i], val); }
template <class T> T Next() { T buf; cin >> buf; return buf; }
istream& Ignore(istream& ist) { string s; ist >> s; return ist; }
bool Inside(int i, int j, int h, int w) { return i >= 0 && i < h && j >= 0 && j < w; }

#ifdef ONLY_MY_ENVIR
#include "Accumulator.h"
#include "Algebraic.h"
#include "BinaryMatrix.h"
#include "BinaryTree.h"
#include "Bipartite.h"
#include "BIT.h"
#include "Compressor.h"
#include "Decompositions.h"
#include "DiscreteLog.h"
#include "DynamicMod.h"
#include "Exponential.h"
#include "Factorization.h"
#include "FFT.h"
#include "FlowSolver.h"
#include "Graph.h"
#include "GraphUtil.h"
#include "IntMod.h"
#include "LazySegmentTree.h"
#include "LIS.h"
#include "Math.h"
#include "MathUtil.h"
#include "Matrix.h"
#include "MinCostFlowSolver.h"
#include "MinMax.h"
#include "Numbers.h"
#include "Optimize.h"
#include "Permutation.h"
#include "Polynomial.h"
#include "Position.h"
#include "Random.h"
#include "Range.h"
#include "Rational.h"
#include "RuntimeMod.h"
#include "SegmentTree.h"
#include "SegmentTree2D.h"
#include "Sets.h"
#include "Shortest.h"
#include "SlidingWindow.h"
#include "SpanningTree.h"
#include "StringSearching.h"
#include "SuffixArray.h"
#include "SwitchList.h"
#include "Timer.h"
#include "Tree.h"
#include "TreeUtil.h"
#include "UnionFind.h"
#include "Util.h"
#include "VectorUtil.h"
#endif

#ifdef __GNUC__
typedef __int128 LLL;
istream& operator>>(istream& ist, __int128& val) { LL tmp; ist >> tmp; val = tmp; return ist; }
ostream& operator<<(ostream& ost, __int128 val) { LL tmp = val; ost << tmp; return ost; }
#endif

int N, M;
LL X[100000];
pair<int, PP> E[100000];
vector<int> G[100000];
vector<int> cand;
int ans;

bool used[100000];
void rec(int j, LL c) {
	if (used[j]) return;
	used[j] = true;
	if (E[j].first <= c) ++ans;
	int a = E[j].second.first;
	int b = E[j].second.second;
	for (int nj : G[a]) rec(nj, c);
	for (int nj : G[b]) rec(nj, c);
}

void sub() {
	reverse(cand.begin(), cand.end());
	for (int j : cand) {
		rec(j, E[j].first);
	}
}

void pre() {
	UnionFindTree uf(N);
	REP(j, 0, M) {
		LL c = E[j].first;
		PP e = E[j].second;
		int from = e.first;
		int to = e.second;
		if (uf.isSame(from, to)) continue;
		LL nw = X[uf.rootOf(from)] + X[uf.rootOf(to)];
		uf.unite(from, to);
		X[uf.rootOf(from)] = nw;
		if (c <= nw) {
			cand.push_back(j);
		}
	}
}

int main() {
	cin >> N >> M;
	REP(i, 0, N) cin >> X[i];
	REP(j, 0, M) {
		int a, b, c;
		cin >> a >> b >> c;
		--a; --b;
		E[j] = { c, PP(a, b) };
	}
	sort(E, E + M);
	
	REP(j, 0, M) {
		int a = E[j].second.first;
		int b = E[j].second.second;
		G[a].push_back(j);
		G[b].push_back(j);
	}
	
	pre();
	sub();
	cout << M - ans << endl;
	return 0;
}



Compiler output:
a.cc: In function 'void pre()':
a.cc:139:9: error: 'UnionFindTree' was not declared in this scope
  139 |         UnionFindTree uf(N);
      |         ^~~~~~~~~~~~~
a.cc:145:21: error: 'uf' was not declared in this scope
  145 |                 if (uf.isSame(from, to)) continue;
      |                     ^~
a.cc:146:27: error: 'uf' was not declared in this scope
  146 |                 LL nw = X[uf.rootOf(from)] + X[uf.rootOf(to)];
      |                           ^~