View Compilation Error

0_0_36424950_5144.cpp: In function 'int main()':
0_0_36424950_5144.cpp:154:25: error: 'rbegin' was not declared in this scope
     std::copy(rbegin(RET), rend(RET), std::ostream_iterator<int>(cout,"\n"));
                         ^
0_0_36424950_5144.cpp:154:36: error: 'rend' was not declared in this scope
     std::copy(rbegin(RET), rend(RET), std::ostream_iterator<int>(cout,"\n"));
                                    ^