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View Compilation Error

0_0_28941136_2899.cpp: In function 'int merge(int, int)':
0_0_28941136_2899.cpp:37:11: error: no matching function for call to 'find(int&)'
  fa=find(a);
           ^
0_0_28941136_2899.cpp:37:11: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_facets.h:48:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_ios.h:37,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:44,
                 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_28941136_2899.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/streambuf_iterator.h:369:5: note: template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT> >::__type std::find(std::istreambuf_iterator<_CharT>, std::istreambuf_iterator<_CharT>, const _CharT2&)
     find(istreambuf_iterator<_CharT> __first,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/streambuf_iterator.h:369:5: note:   template argument deduction/substitution failed:
0_0_28941136_2899.cpp:37:11: note:   mismatched types 'std::istreambuf_iterator<_CharT>' and 'int'
  fa=find(a);
           ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_28941136_2899.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3770:5: note: template<class _IIter, class _Tp> _IIter std::find(_IIter, _IIter, const _Tp&)
     find(_InputIterator __first, _InputIterator __last,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3770:5: note:   template argument deduction/substitution failed:
0_0_28941136_2899.cpp:37:11: note:   candidate expects 3 arguments, 1 provided
  fa=find(a);
           ^
0_0_28941136_2899.cpp:38:11: error: no matching function for call to 'find(int&)'
  fb=find(b);
           ^
0_0_28941136_2899.cpp:38:11: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_facets.h:48:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_ios.h:37,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:44,
                 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_28941136_2899.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/streambuf_iterator.h:369:5: note: template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT> >::__type std::find(std::istreambuf_iterator<_CharT>, std::istreambuf_iterator<_CharT>, const _CharT2&)
     find(istreambuf_iterator<_CharT> __first,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/streambuf_iterator.h:369:5: note:   template argument deduction/substitution failed:
0_0_28941136_2899.cpp:38:11: note:   mismatched types 'std::istreambuf_iterator<_CharT>' and 'int'
  fb=find(b);
           ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_28941136_2899.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3770:5: note: template<class _IIter, class _Tp> _IIter std::find(_IIter, _IIter, const _Tp&)
     find(_InputIterator __first, _InputIterator __last,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3770:5: note:   template argument deduction/substitution failed:
0_0_28941136_2899.cpp:38:11: note:   candidate expects 3 arguments, 1 provided
  fb=find(b);
           ^
0_0_28941136_2899.cpp:41:6: error: 'set' was not declared in this scope
      set[fa]=fb;
      ^


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