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View Compilation Error

0_0_14899804_11047.cpp: In function 'int main()':
0_0_14899804_11047.cpp:201:42: error: no matching function for call to 'make_pair(int&, int&)'
    ee[u].push_back(make_pair<int,int>(v,l));
                                          ^
0_0_14899804_11047.cpp:201:42: note: candidate is:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14899804_11047.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&)
     make_pair(_T1&& __x, _T2&& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note:   template argument deduction/substitution failed:
0_0_14899804_11047.cpp:201:42: note:   cannot convert 'v' (type 'int') to type 'int&&'
    ee[u].push_back(make_pair<int,int>(v,l));
                                          ^
0_0_14899804_11047.cpp:202:42: error: no matching function for call to 'make_pair(int&, int&)'
    ee[v].push_back(make_pair<int,int>(u,l));
                                          ^
0_0_14899804_11047.cpp:202:42: note: candidate is:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14899804_11047.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&)
     make_pair(_T1&& __x, _T2&& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note:   template argument deduction/substitution failed:
0_0_14899804_11047.cpp:202:42: note:   cannot convert 'u' (type 'int') to type 'int&&'
    ee[v].push_back(make_pair<int,int>(u,l));
                                          ^


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