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View Compilation Error

0_0_38121591_27282.cpp: In function 'void solve(int, int)':
0_0_38121591_27282.cpp:30:12: error: 'swap' was not declared in this scope
   swap(l, r);
            ^
0_0_38121591_27282.cpp:30:12: note: suggested alternatives:
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_38121591_27282.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:128:3: note:   'std::swap'
   swap(bool& __x, _Bit_reference __y) noexcept
   ^
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++/new:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/new_allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/c++allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/allocator.h:46,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:62,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:60,
                 from 0_0_38121591_27282.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)
     ^
0_0_38121591_27282.cpp: In function 'int main()':
0_0_38121591_27282.cpp:53:12: error: 'swap' was not declared in this scope
   swap(1, n);
            ^
0_0_38121591_27282.cpp:53:12: note: suggested alternatives:
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_38121591_27282.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:128:3: note:   'std::swap'
   swap(bool& __x, _Bit_reference __y) noexcept
   ^
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++/new:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/new_allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/c++allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/allocator.h:46,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:62,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:60,
                 from 0_0_38121591_27282.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)
     ^


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