Language: C++

#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
using namespace std;

#define NONE -1

int c,n,m,s,d;
vector < vector <int> > P;
vector < vector <int> > E;
vector <int> R;
vector <bool> V;
int answer;

void solve( int t )
{
	if ( t == d )
	{
		sort( R.rbegin(), R.rend() );
		for ( int i = 0; i < min(c,R.size()); i++ )
		{
			R[i] /= 2;
		}
		if ( answer == -1 )
			answer = accumulate( R.begin(), R.end(), 0 );
		else
			answer = min( answer, accumulate( R.begin(), R.end(), 0 ) );
	}
	else
	{
		V[t] = true;
		for ( vector <int>::iterator it = E[t].begin(); it != E[t].end(); it++ )
		{
			if ( V[*it] == false )
			{
				R.push_back( P[t][*it] );
				solve(*it);
				R.pop_back();
			}
		}
		V[t] = false;
	}
}

int main( void )
{
	while ( cin >> c >> n >> m >> s >> d && c && n && m && s && d )
	{
		s--;
		d--;
		P = vector < vector <int> >(n+1, vector <int>(n+1,NONE));
		E = vector < vector <int> >(n+1);
		for ( int i = 0; i < m; i++ )
		{
			int a, b, f;
			cin >> a >> b >> f;
			P[a-1][b-1] = f;
			P[b-1][a-1] = f;
			E[a-1].push_back( b-1 );
			E[b-1].push_back( a-1 );
		}

		R = vector <int>();
		V = vector <bool>(n+1,false);
		answer = -1;
		solve( s );
		cout << answer << endl;
	}

	return 0;
}

Compiler output:
a.cc: In function 'void solve(int)':
a.cc:22:41: error: no matching function for call to 'min(int&, std::vector<int>::size_type)'
   22 |                 for ( int i = 0; i < min(c,R.size()); i++ )
      |                                      ~~~^~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:22:41: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::vector<int>::size_type' {aka 'long unsigned int'})
   22 |                 for ( int i = 0; i < min(c,R.size()); i++ )
      |                                      ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:22:41: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   22 |                 for ( int i = 0; i < min(c,R.size()); i++ )
      |                                      ~~~^~~~~~~~~~~~