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View Compilation Error

0_0_39323824_7949.cpp:8:1: error: 'vector' does not name a type
    8 | vector<int> e[N];
      | ^~~~~~
0_0_39323824_7949.cpp: In function 'void dfs(int, int)':
0_0_39323824_7949.cpp:31:21: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   31 |         for(int v : e[u])
      |                     ^
      |                     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_39323824_7949.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_39323824_7949.cpp: In function 'void solve()':
0_0_39323824_7949.cpp:60:17: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   60 |                 e[u].push_back(v) , e[v].push_back(u);
      |                 ^
      |                 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_39323824_7949.cpp:67:41: error: 'e' was not declared in this scope; did you mean 'std::numbers::e'?
   67 |         for(int i=1; i<=n; i++)         e[i].clear();
      |                                         ^
      |                                         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>;
      |                           ^


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