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View Compilation Error

0_0_35947165_22754.cpp: In function 'void change(Complex*, int)':
0_0_35947165_22754.cpp:31:31: error: 'swap' was not declared in this scope
     if (i < j) swap(y[i], y[j]);
                               ^
0_0_35947165_22754.cpp:31:31: note: suggested alternatives:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 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_35947165_22754.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2736:5: note:   'std::swap'
     swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/exception:162:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:39,
                 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_35947165_22754.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/exception_ptr.h:160:5: note:   'std::__exception_ptr::swap'
     swap(exception_ptr& __lhs, exception_ptr& __rhs)
     ^


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