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View Compilation Error

0_0_29163126_29966.cpp: In function 'int main(int, char**)':
0_0_29163126_29966.cpp:51:18: error: 'swap' was not declared in this scope
   if(s<n)swap(n,s);
                  ^
0_0_29163126_29966.cpp:51:18: note: suggested alternatives:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:62:0,
                 from 0_0_29163126_29966.cpp:8:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_multimap.h:955:5: note:   'std::swap'
     swap(multimap<_Key, _Tp, _Compare, _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++/new:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_construct.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tempbuf.h:60,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:62,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_29163126_29966.cpp:3:
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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