Language: C++

#include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define rep(i,n) for(int i=0, i##_len=(int)(n); i<i##_len; i++)
#define reps(i,n) for(int i=1 , i##_len=(int)(n);i<=i##_len;i++)
#define rrep(i,n) for(int i=((int)(n)-1);i>=0;i--)
#define rreps(i,n) for(int i=((int)(n));i>0;i--)
#define all(x) (x).begin(), (x).end()
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define solve(a) ((a)?"Yes":"No")
typedef vector<long long> V;
typedef vector<V> VV;
typedef pair<long long , long long> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1;} return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1;} return 0;}
const long long INFLL = 1LL<<62;
const int INF = 1<<30;
const double PI=acos(-1);
//ワーシャルフロイゼ法(隣接行列を受け取り、それぞれの最短を受け取る、size:10^2-)
vector<vector<long long>> WarshallFloyd(vector<vector<long long>> &pathmatrix){
    int index=pathmatrix.size();
    vector<vector<long long >>res=pathmatrix;
    for (int a = 0; a < index; a++){
        for (int b = 0; b < index; b++){
            for (int c = 0; c < index; c++){ 
                chmin(res[b][c], res[b][a] + res[a][c]);
            }
        }
    }
    return (res);
}
int main(){
    int n;
    ll ans=0LL;
    ll stack=0LL;
    cin >>n;
    VV ppath(n,V(n));
    VV upath(n, V(n),0LL);

    rep(i,n){
        rep(j,n){
            cin>>ppath[i][j];
            //ans+=ppath[i][j];
        }
    }
    clog<<ans<<endl;
        int index = ppath.size();
        vector<vector<long long>> res = ppath;
        for (int a = 0; a < index; a++)
        {
            for (int b = 0; b < index; b++)
            {
                for (int c = 0; c < index; c++)
                {
                    if ((res[b][c] == res[b][a] + res[a][c]) and a!=b and a!=c){
                        upath[b][a]++;
                        upath[a][c]++;
                    }else if (res[b][c] > res[b][a] + res[a][c]){
                        ans=-2;
                        cout<<-1<<endl;
                        return 0;
                    }else{
                        upath[b][c]++;
                    }
                    //chmin(res[b][c], res[b][a] + res[a][c]);
                }
            }
        }
        
    rep(i,n){
        rep(i,j){
            if(upath[i][j]!=0){
                ans+=ppath[i][j];
            }
        }
    }

    cout<<ans/2<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:25: error: no matching function for call to 'std::vector<std::vector<long long int> >::vector(int&, V, long long int)'
   41 |     VV upath(n, V(n),0LL);
      |                         ^
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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long 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:41:25: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<long long int>')
   41 |     VV upath(n, V(n),0LL);
      |                         ^
/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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; allocator_type = std::allocator<std::vector<long long int> >]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:7: note:   candidate expects 2 arguments, 3 provided
/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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<long long int> >]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note:   candidate expects 2 arguments, 3 provided
/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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; allocator_type = std::allocator<std::vector<long long 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:640:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<std::vector<long long int> >&&'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |              ~~~~~~~~~^~~~
/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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; allocator_type = std::allocator<std::vector<long long 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:635:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<std::vector<long long int> >&&'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |              ~~~~~~~~~^~~~
/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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<long long int> >]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:7: note:   candidate expects 2 arguments, 3 provided
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 3 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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 3 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 = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; size_type = long unsigned int; value_type = std::vector<long long int>; allocator_type = std::allocator<std::vector<long long int> >]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:570:36: note:   no known conversion for argument 3 from 'long long int' to 'const std::vector<std::vector<long long int> >::allocator_type&' {aka 'const std::allocator<std::vector<long long int> >&'}
  570 |              const allocator_type& __a = allocator_type())
      |              ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; size_type = long unsigned int; allocator_type = std::allocator<std::vector<long long int> >]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note:   candidate expects 2 arguments, 3 provided
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; allocator_type = std::allocator<std::vector<long long int> >]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 3 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 3 provided
a.cc:74:15: error: 'j' was not declared in this scope
   74 |         rep(i,j){
      |               ^
a.cc:4:45: note: in definition of macro 'rep'
    4 | #define rep(i,n) for(int i=0, i##_len=(int)(n); i<i##_len; i++)
      |                                             ^