Language: C++

#include <bits/stdc++.h>
#define REP(i,n) for(int i=0;i<n;i++)
#define REPP(i,n) for(int i=1;i<=n;i++)
const double PI = acos(-1);
const double EPS = 1e-15;
long long INF=(long long)1E17;
#define i_7 (long long)(1E9+7)
long mod(long a){
    long long c=a%i_7;
    if(c>=0)return c;
    return c+i_7;
}
using namespace std;
bool prime_(int n){
  if(n==1){
    return false;
  }else if(n==2){
    return true;
  }else{
    for(int i=2;i<=sqrt(n);i++){
      if(n%i==0){
        return false;
      }
    }
    return true;
  }
}

long long gcd_(long long a, long long b){
  if(a<b){
    swap(a,b);
  }
  if(a%b==0){
    return b;
  }else{
    return gcd_(b,a%b);
  }
}
 
long long lcm_(long long x, long long y){
  return (x/gcd_(x,y))*y;
}
 
class UnionFind {
    public:
    //各頂点の親の番号を格納する。その頂点自身が親だった場合は-(その集合のサイズ)を入れる。
    vector<int> Parent;
    
    //クラスを作るときは、Parentの値を全て-1にする。
    //以下のようにすると全てバラバラの頂点として解釈できる。
    UnionFind(int N) {
        Parent = vector<int>(N, -1);
    }
    
    //Aがどのグループに属しているか調べる
    int root(int A) {
        if (Parent[A] < 0) return A;
        return Parent[A] = root(Parent[A]);
    }
    
    //自分のいるグループの頂点数を調べる
    int size(int A) {
        return -Parent[root(A)];//先祖をrootで取っておきたい。
    }
    
    //AとBをくっ付ける
    bool connect(int A, int B) {
        //AとBを直接つなぐのではなく、root(A)にroot(B)をくっつける
        A = root(A);
        B = root(B);
        if (A == B) {
            //すでにくっついてるからくっ付けない
            return false;
        }
        
        //大きい方(A)に小さいほう(B)をくっ付けたい
        //大小が逆だったらAとBをひっくり返す。
        if (size(A) < size(B)) swap(A, B);
        
        //Aのサイズを更新する
        Parent[A] += Parent[B];
        //Bの親をAに変更する
        Parent[B] = A;
        
        return true;
    }
};

int main(){
  
  int n,m;
  cin>>n>>m;
  vector<int> dist(n, vector<int>(n, 10'000'000));
  REP(i,n){
    dist[i][i] = 0;
  }
  int a[m],b[m],c[m];
  REP(i,m){
    cin>>a[i]>>b[i]>>c[i];
    a[i]--;b[i]--;
    dist[a[i]][b[i]] = dist[b[i]][a[i]] = c[i];
  }
  REP(k,n){
    REP(i,n){
      REP(j,n){
        dist[i][j] = min(dist[i][j], dist[i][k]+dist[k][j]);
      }
    }
  }
  
  int ans=0;
  bool flag;
  REP(i,m){
    flag = false;
    REP(s,n){
      REP(t,n){
        if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
          flag = true;
          break;
        }
      }
      if(flag)break;
    }
    if(flag)ans++;
  }
  
  cout<<ans<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:93:49: error: no matching function for call to 'std::vector<int>::vector(int&, std::vector<int>)'
   93 |   vector<int> dist(n, vector<int>(n, 10'000'000));
      |                                                 ^
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = int; _Alloc = std::allocator<int>]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   template argument deduction/substitution failed:
a.cc:93:49: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<int>')
   93 |   vector<int> dist(n, vector<int>(n, 10'000'000));
      |                                                 ^
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:43: note:   no known conversion for argument 1 from 'int' to 'std::initializer_list<int>'
  678 |       vector(initializer_list<value_type> __l,
      |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>; std::__type_identity_t<_Alloc> = std::allocator<int>]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<int>&&'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |              ~~~~~~~~~^~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>; std::__type_identity_t<_Alloc> = std::allocator<int>]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:28: note:   no known conversion for argument 1 from 'int' to 'const std::vector<int>&'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |              ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = int; _Alloc = std::allocator<int>]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int; value_type = int; allocator_type = std::allocator<int>]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:47: note:   no known conversion for argument 2 from 'std::vector<int>' to 'const std::vector<int>::value_type&' {aka 'const int&'}
  569 |       vector(size_type __n, const value_type& __value,
      |                             ~~~~~~~~~~~~~~~~~~^~~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int; allocator_type = std::allocator<int>]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:51: note:   no known conversion for argument 2 from 'std::vector<int>' to 'const std::vector<int>::allocator_type&' {aka 'const std::allocator<int>&'}
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |                             ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = int; _Alloc = std::allocator<int>; allocator_type = std::allocator<int>]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = int; _Alloc = std::allocator<int>]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 2 provided
a.cc:95:12: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
   95 |     dist[i][i] = 0;
      |            ^
a.cc:101:15: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  101 |     dist[a[i]][b[i]] = dist[b[i]][a[i]] = c[i];
      |               ^
a.cc:101:34: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  101 |     dist[a[i]][b[i]] = dist[b[i]][a[i]] = c[i];
      |                                  ^
a.cc:106:16: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  106 |         dist[i][j] = min(dist[i][j], dist[i][k]+dist[k][j]);
      |                ^
a.cc:106:33: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  106 |         dist[i][j] = min(dist[i][j], dist[i][k]+dist[k][j]);
      |                                 ^
a.cc:106:45: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  106 |         dist[i][j] = min(dist[i][j], dist[i][k]+dist[k][j]);
      |                                             ^
a.cc:106:56: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  106 |         dist[i][j] = min(dist[i][j], dist[i][k]+dist[k][j]);
      |                                                        ^
a.cc:117:19: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                   ^
a.cc:117:31: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                               ^
a.cc:117:53: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                                                     ^
a.cc:117:67: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                                                                   ^
a.cc:117:79: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                                                                               ^
a.cc:117:101: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
  117 |         if(dist[s][t]==dist[s][a[i]]+c[i]+dist[b[i]][t] || dist[s][t]==dist[s][b[i]]+c[i]+dist[a[i]][t]){
      |                                                                                                     ^