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View Compilation Error

0_0_23794704_15017.cpp: In function 'void gauss_elimination(double (&)[105][105], int)':
0_0_23794704_15017.cpp:38:38: error: 'swap' was not declared in this scope
                 swap(g[r][j], g[i][j]);
                                      ^
0_0_23794704_15017.cpp:38:38: 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_23794704_15017.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_23794704_15017.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_23794704_15017.cpp: In function 'int main()':
0_0_23794704_15017.cpp:105:5: error: 'ios' has not been declared
     ios::sync_with_stdio(false);
     ^


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