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View Compilation Error

0_0_32961088_5049.cpp: In function 'int main()':
0_0_32961088_5049.cpp:17:39: error: no matching function for call to 'make_pair(int&, int&)'
 #define mp(a,b) make_pair<int,int>(a,b)
                                       ^
0_0_32961088_5049.cpp:69:22: note: in expansion of macro 'mp'
     ed[ne].push_back(mp(a,b));
                      ^
0_0_32961088_5049.cpp:17:39: note: candidate is:
 #define mp(a,b) make_pair<int,int>(a,b)
                                       ^
0_0_32961088_5049.cpp:69:22: note: in expansion of macro 'mp'
     ed[ne].push_back(mp(a,b));
                      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_32961088_5049.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_32961088_5049.cpp:17:39: note:   cannot convert 'a' (type 'int') to type 'int&&'
 #define mp(a,b) make_pair<int,int>(a,b)
                                       ^
0_0_32961088_5049.cpp:69:22: note: in expansion of macro 'mp'
     ed[ne].push_back(mp(a,b));
                      ^


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