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View Compilation Error

0_0_38125363_29717.cpp: In function 'int main()':
0_0_38125363_29717.cpp:34:28: error: no matching function for call to 'std::vector<int>::push_back(std::initializer_list<int>&)'
             ans.push_back(u);
                            ^
0_0_38125363_29717.cpp:34:28: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/random.h:34,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:49,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_38125363_29717.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:913:7: note: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::value_type = int]
       push_back(const value_type& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:913:7: note:   no known conversion for argument 1 from 'std::initializer_list<int>' to 'const value_type& {aka const int&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:931:7: note: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::value_type = int]
       push_back(value_type&& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:931:7: note:   no known conversion for argument 1 from 'std::initializer_list<int>' to 'std::vector<int>::value_type&& {aka int&&}'
0_0_38125363_29717.cpp:35:26: error: no match for 'operator[]' (operand types are 'std::vector<int> [30005]' and 'std::initializer_list<int>')
             for (auto v:e[u])
                          ^


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