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View Compilation Error

0_0_15550417_1864.cpp: In function 'void getrange(int, int)':
0_0_15550417_1864.cpp:135:45: error: no matching function for call to 'make_pair(int&, int&)'
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                             ^
0_0_15550417_1864.cpp:144:16: note: in expansion of macro 'mkpr'
   rg.push_back(mkpr(FF[fx], FF[x]));
                ^
0_0_15550417_1864.cpp:135:45: note: candidate is:
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                             ^
0_0_15550417_1864.cpp:144:16: note: in expansion of macro 'mkpr'
   rg.push_back(mkpr(FF[fx], FF[x]));
                ^
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_15550417_1864.cpp:6:
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_15550417_1864.cpp:144:26: note:   cannot convert 'FF[fx]' (type 'int') to type 'int&&'
   rg.push_back(mkpr(FF[fx], FF[x]));
                          ^
0_0_15550417_1864.cpp:135:41: note: in definition of macro 'mkpr'
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                         ^
0_0_15550417_1864.cpp:135:45: error: no matching function for call to 'make_pair(int&, int&)'
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                             ^
0_0_15550417_1864.cpp:150:15: note: in expansion of macro 'mkpr'
  rg.push_back(mkpr(FF[x], FF[y]));
               ^
0_0_15550417_1864.cpp:135:45: note: candidate is:
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                             ^
0_0_15550417_1864.cpp:150:15: note: in expansion of macro 'mkpr'
  rg.push_back(mkpr(FF[x], FF[y]));
               ^
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_15550417_1864.cpp:6:
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_15550417_1864.cpp:150:24: note:   cannot convert 'FF[x]' (type 'int') to type 'int&&'
  rg.push_back(mkpr(FF[x], FF[y]));
                        ^
0_0_15550417_1864.cpp:135:41: note: in definition of macro 'mkpr'
 #define mkpr(x, y) make_pair<int, int> (x, y)
                                         ^


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