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View Compilation Error

0_0_38717935_22186.cpp:19:1: error: 'vector' does not name a type
   19 | vector<pair<int ,int>> v;
      | ^~~~~~
0_0_38717935_22186.cpp:20:1: error: 'vector' does not name a type
   20 | vector<node> e;
      | ^~~~~~
0_0_38717935_22186.cpp: In function 'double kulusi()':
0_0_38717935_22186.cpp:25:23: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   25 |         for(int i=0;i<e.size();i++)
      |                       ^
      |                       std::numbers::e
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/max_size_type.h:37,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ranges_base.h:39,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string_view:48,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:47,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:54,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/locale_classes.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ios_base.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:44,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:41,
                 from 0_0_38717935_22186.cpp:1:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/numbers:122:27: note: 'std::numbers::e' declared here
  122 |   inline constexpr double e = e_v<double>;
      |                           ^
0_0_38717935_22186.cpp:28:23: error: 'y' was not declared in this scope
   28 |                 if(x!=y)
      |                       ^
0_0_38717935_22186.cpp: In function 'int main()':
0_0_38717935_22186.cpp:56:25: error: 'v' was not declared in this scope
   56 |                         v.push_back(lg);
      |                         ^
0_0_38717935_22186.cpp:59:55: error: 'sqrt' was not declared in this scope
   59 |                                 ld.u=j,ld.v=i,ld.cont=sqrt(ping(v[i],v[j]));
      |                                                       ^~~~
0_0_38717935_22186.cpp:62:33: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   62 |                                 e.push_back(ld);
      |                                 ^
      |                                 std::numbers::e
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/numbers:122:27: note: 'std::numbers::e' declared here
  122 |   inline constexpr double e = e_v<double>;
      |                           ^
0_0_38717935_22186.cpp:65:22: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   65 |                 sort(e.begin(),e.end(),cmp);
      |                      ^
      |                      std::numbers::e
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/numbers:122:27: note: 'std::numbers::e' declared here
  122 |   inline constexpr double e = e_v<double>;
      |                           ^
0_0_38717935_22186.cpp:71:17: error: 'v' was not declared in this scope
   71 |                 v.clear();
      |                 ^


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