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View Compilation Error

0_0_33023868_1517.cpp: In function 'int merge(int, int)':
0_0_33023868_1517.cpp:23:16: error: no matching function for call to 'find(int&)'
  int i = find(b);
                ^
0_0_33023868_1517.cpp:23:16: 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++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_33023868_1517.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_33023868_1517.cpp:23:16: note:   mismatched types 'std::istreambuf_iterator<_CharT>' and 'int'
  int i = find(b);
                ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_33023868_1517.cpp:1:
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_33023868_1517.cpp:23:16: note:   candidate expects 3 arguments, 1 provided
  int i = find(b);
                ^
0_0_33023868_1517.cpp: In function 'int main()':
0_0_33023868_1517.cpp:60:38: error: no matching function for call to 'find(int&)'
     if (tree[i] > 0 && c[find(tree[i])]++ == 0)
                                      ^
0_0_33023868_1517.cpp:60:38: 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++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_33023868_1517.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_33023868_1517.cpp:60:38: note:   mismatched types 'std::istreambuf_iterator<_CharT>' and 'int'
     if (tree[i] > 0 && c[find(tree[i])]++ == 0)
                                      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_33023868_1517.cpp:1:
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_33023868_1517.cpp:60:38: note:   candidate expects 3 arguments, 1 provided
     if (tree[i] > 0 && c[find(tree[i])]++ == 0)
                                      ^
0_0_33023868_1517.cpp:74:13: error: no matching function for call to 'find(int&)'
   if (find(a) == 0)
             ^
0_0_33023868_1517.cpp:74:13: 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++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_33023868_1517.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_33023868_1517.cpp:74:13: note:   mismatched types 'std::istreambuf_iterator<_CharT>' and 'int'
   if (find(a) == 0)
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_33023868_1517.cpp:1:
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_33023868_1517.cpp:74:13: note:   candidate expects 3 arguments, 1 provided
   if (find(a) == 0)
             ^


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