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View Compilation Error

0_0_38549286_13874.cpp: In function 'void push_down(int)':
0_0_38549286_13874.cpp:21:31: error: 'swap' was not declared in this scope
     swap(tr[k].s[1],tr[k].s[0]);
                               ^
0_0_38549286_13874.cpp:21:31: note: suggested alternatives:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/unordered_set:48:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:116,
                 from 0_0_38549286_13874.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/unordered_set.h:1325:5: note:   'std::swap'
     swap(unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __x,
     ^
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++/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_38549286_13874.cpp:1:
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)
     ^
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_38549286_13874.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h: In instantiation of 'void std::reverse(_BIter, _BIter) [with _BIter = int]':
0_0_38549286_13874.cpp:87:31:   required from here
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:1183:71: error: no matching function for call to '__iterator_category(int&)'
       std::__reverse(__first, __last, std::__iterator_category(__first));
                                                                       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:1183:71: note: candidate is:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:65:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 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_38549286_13874.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_types.h:201:5: note: template<class _Iter> typename std::iterator_traits<_Iterator>::iterator_category std::__iterator_category(const _Iter&)
     __iterator_category(const _Iter&)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_types.h:201:5: note:   template argument deduction/substitution failed:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_types.h: In substitution of 'template<class _Iter> typename std::iterator_traits<_Iterator>::iterator_category std::__iterator_category(const _Iter&) [with _Iter = int]':
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:1183:71:   required from 'void std::reverse(_BIter, _BIter) [with _BIter = int]'
0_0_38549286_13874.cpp:87:31:   required from here
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_types.h:201:5: error: no type named 'iterator_category' in 'struct std::iterator_traits<int>'


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