Language: C++

#include <bits/stdc++.h>

using namespace std;

struct edge
{
  int to, cost;
};

typedef pair< int, int > Pi;
const int INF = 1LL << 29;


int N, M, P;
int v1[100], v2[100];
int dp1[100], dp2[100];
vector< vector< edge > > g;

void Dijkstra(int s, int *v, int *dp)
{
  priority_queue< Pi, vector< Pi >, greater< Pi > > que;
  fill_n(v, N, INF);
  fill_n(dp, N, 0);

  que.emplace(0, s);
  v[s] = 0;
  dp[s] = 1;

  while(!que.empty()) {
    auto p = que.top();
    que.pop();
    if(p.first > v[p.second]) continue;
    for(auto &e : g[p.second]) {
      if(p.first + e.cost < v[e.to]) {
        v[e.to] = p.first + e.cost;
        dp[e.to] = dp[p.second];
        que.emplace(v[e.to], e.to);
      } else if(p.first + e.cost == v[e.to]) {
        dp[e.to] += dp[p.second];
      }
    }
  }
}

int main()
{
  cout << fixed << setprecision(10);

  while(cin >> N >> M >> P, N) {
    g = vector< vector< edge > >(N, vector< int >());

    while(M--) {
      int X, Y, Z;
      cin >> X >> Y >> Z;
      g[X].emplace_back((edge) {Y, Z});
      g[Y].emplace_back((edge) {X, Z});
    }
    Dijkstra(0, v1, dp1);
    Dijkstra(N - 1, v2, dp2);

    while(P--) {
      int A;
      cin >> A;
      if(v1[A] + v2[A] == v1[N - 1])
        cout << (double) dp1[A] * dp2[A] / dp1[N - 1] << endl;
      else
        cout << 0 << endl;
    }
    cout << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:50:52: error: no matching function for call to 'std::vector<std::vector<edge> >::vector(int&, std::vector<int>)'
   50 |     g = vector< vector< edge > >(N, vector< int >());
      |                                                    ^
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<edge>; _Alloc = std::allocator<std::vector<edge> >]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   template argument deduction/substitution failed:
a.cc:50:52: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<int>')
   50 |     g = vector< vector< edge > >(N, vector< int >());
      |                                                    ^
/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<edge>; _Alloc = std::allocator<std::vector<edge> >; allocator_type = std::allocator<std::vector<edge> >]'
  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<std::vector<edge> >'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<edge> >]'
  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<std::vector<edge> >&&'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; allocator_type = std::allocator<std::vector<edge> >; 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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; allocator_type = std::allocator<std::vector<edge> >; 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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<edge> >]'
  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<std::vector<edge> >&'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >]'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >]'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; size_type = long unsigned int; value_type = std::vector<edge>; allocator_type = std::allocator<std::vector<edge> >]'
  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<std::vector<edge> >::value_type&' {aka 'const std::vector<edge>&'}
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; size_type = long unsigned int; allocator_type = std::allocator<std::vector<edge> >]'
  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<std::vector<edge> >::allocator_type&' {aka 'const std::allocator<std::vector<edge> >&'}
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >; allocator_type = std::allocator<std::vector<edge> >]'
  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 = std::vector<edge>; _Alloc = std::allocator<std::vector<edge> >]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 2 provided