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View Compilation Error

0_0_26235644_9411.cpp: In member function 'void MaxClique::expand(std::vector<std::pair<int, int> >&)':
0_0_26235644_9411.cpp:59:21: error: no matching function for call to 'std::vector<std::pair<int, int> >::push_back(int&)'
             cur.PB(x);cur.pop_back();
                     ^
0_0_26235644_9411.cpp:59:21: 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_26235644_9411.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 = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, 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 'int' to 'const value_type& {aka const std::pair<int, 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 = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >; std::vector<_Tp, _Alloc>::value_type = std::pair<int, 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 'int' to 'std::vector<std::pair<int, int> >::value_type&& {aka std::pair<int, int>&&}'
0_0_26235644_9411.cpp:63:39: error: no match for 'operator=' (operand types are 'std::vector<int>' and 'std::vector<std::pair<int, int> >')
                 if(SZ(cur)>SZ(ans))ans=cur;
                                       ^
0_0_26235644_9411.cpp:63:39: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:69:0,
                 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_26235644_9411.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/vector.tcc:167:5: note: std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = int; _Alloc = std::allocator<int>]
     vector<_Tp, _Alloc>::
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/vector.tcc:167:5: note:   no known conversion for argument 1 from 'std::vector<std::pair<int, int> >' to 'const std::vector<int>&'
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_26235644_9411.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:448:7: note: std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::vector<_Tp, _Alloc>&&) [with _Tp = int; _Alloc = std::allocator<int>]
       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:448:7: note:   no known conversion for argument 1 from 'std::vector<std::pair<int, int> >' to 'std::vector<int>&&'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:470:7: note: std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = int; _Alloc = std::allocator<int>]
       operator=(initializer_list<value_type> __l)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:470:7: note:   no known conversion for argument 1 from 'std::vector<std::pair<int, int> >' to 'std::initializer_list<int>'


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