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View Compilation Error

0_0_37209441_12102.cpp: In function 'poly graham(point*, int)':
0_0_37209441_12102.cpp:67:4: error: no match for 'operator+=' (operand types are 'poly' and 'int')
 ans+=1;
    ^
0_0_37209441_12102.cpp:68:19: error: no match for 'operator-' (operand types are 'poly' and 'int')
         return ans-1;
                   ^
0_0_37209441_12102.cpp:68:19: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
                 from 0_0_37209441_12102.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:328:5: note: template<class _Iterator> typename std::reverse_iterator<_Iterator>::difference_type std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator-(const reverse_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:328:5: note:   template argument deduction/substitution failed:
0_0_37209441_12102.cpp:68:20: note:   'poly' is not derived from 'const std::reverse_iterator<_Iterator>'
         return ans-1;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
                 from 0_0_37209441_12102.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:380:5: note: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator-(const reverse_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:380:5: note:   template argument deduction/substitution failed:
0_0_37209441_12102.cpp:68:20: note:   'poly' is not derived from 'const std::reverse_iterator<_Iterator>'
         return ans-1;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
                 from 0_0_37209441_12102.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1121:5: note: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator-(const move_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1121:5: note:   template argument deduction/substitution failed:
0_0_37209441_12102.cpp:68:20: note:   'poly' is not derived from 'const std::move_iterator<_Iterator>'
         return ans-1;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
                 from 0_0_37209441_12102.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1128:5: note: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator-(const move_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1128:5: note:   template argument deduction/substitution failed:
0_0_37209441_12102.cpp:68:20: note:   'poly' is not derived from 'const std::move_iterator<_Iterator>'
         return ans-1;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:65:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/random.h:34,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:49,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_37209441_12102.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:208:3: note: std::ptrdiff_t std::operator-(const std::_Bit_iterator_base&, const std::_Bit_iterator_base&)
   operator-(const _Bit_iterator_base& __x, const _Bit_iterator_base& __y)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:208:3: note:   no known conversion for argument 1 from 'poly' to 'const std::_Bit_iterator_base&'
0_0_37209441_12102.cpp: In function 'int main()':
0_0_37209441_12102.cpp:163:4: error: 'cin' was not declared in this scope
    cin>>t;
    ^


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