Language: C++

#include<vector>
#include<list>
#include<algorithm>
#include<iostream>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
using namespace std;
void f(int a[][21],int b[],int c,int e,int m){
  int i;
  if(c==e){
    if(b[c]==-1||b[c]>m)
      b[c]=m;
  }else if(b[c]==-1||b[c]>m){
    b[c]=m;
    for(i=1;i<21;i++){
      if(a[c][i])
	f(a,b,i,e,m+a[c][i]);
    }
  }
  return;
}
int main(){
  int i;
  int a[21][21],b[21],m,n,v,w,x,y;
  memset(a,0,sizeof(a));
  cin>>n>>m;
  for(i=0;i<m;i++){
    int p,q,r,s;
    scanf("%d,%d,%d,%d",&p,&q,&r,&s);
    a[p][q]=r;
    a[q][p]=s;
  }
  scanf("%d,%d,%d,%d",&v,&w,&x,&y);
  memset(b,-1,sizeof(b));
  f(a,b,v,w,0);
  x-=b[w];
  memset(b,-1,sizeof(b));
  f(a,b,w,v,0);
  x-=b[v];
  cout<<x-y>0?x-y:0<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:12: error: no match for 'operator>' (operand types are 'std::basic_ostream<char>' and 'int')
   43 |   cout<<x-y>0?x-y:0<<endl;
      |   ~~~~~~~~~^~
      |       |     |
      |       |     int
      |       std::basic_ostream<char>
a.cc:43:12: note: candidate: 'operator>(int, int)' (built-in)
   43 |   cout<<x-y>0?x-y:0<<endl;
      |   ~~~~~~~~~^~
a.cc:43:12: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'int'
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/vector:62,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_pair.h:1058:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator>(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1058 |     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1058:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:462:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  462 |     operator>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:462:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/stl_iterator.h:507:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  507 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:507:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1714 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1774 |     operator>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
In file included from /usr/include/c++/14/vector:66:
/usr/include/c++/14/bits/stl_vector.h:2102:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator>(const vector<_Tp, _Alloc>&, const vector<_Tp, _Alloc>&)'
 2102 |     operator>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:2102:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::vector<_Tp, _Alloc>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/vector:87:
/usr/include/c++/14/tuple:2619:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator>(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2619 |     operator>(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2619:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::tuple<_UTypes ...>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
In file included from /usr/include/c++/14/list:65,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_list.h:2203:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator>(const __cxx11::list<_Tp, _Alloc>&, const __cxx11::list<_Tp, _Alloc>&)'
 2203 |     operator>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_list.h:2203:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::list<_Tp, _Alloc>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 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:4:
/usr/include/c++/14/string_view:695:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  695 |     operator> (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:695:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/string_view:702:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  702 |     operator> (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:702:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/string_view:710:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  710 |     operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:710:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/basic_string.h:3915:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3915 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3915:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/basic_string.h:3929:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3929 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3929:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
/usr/include/c++/14/bits/basic_string.h:3942:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3942 |     operator>(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3942:5: note:   template argument deduction/substitution failed:
a.cc:43:13: note:   mismatched types 'const _CharT*' and 'std::basic_ostream<char>'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |             ^
a.cc:43:20: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   43 |   cout<<x-y>0?x-y:0<<endl;
      |                   ~^~~~~~