Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:25:13: warning: unused variable ‘x’ [-Wunused-variable] int x; ^ user.cpp:21:19: warning: unused variable ‘lol’ [-Wunused-variable] int n,k,MAX=0,lol=0; ^ In file included from /usr/include/c++/4.8/algorithm:62:0, from user.cpp:3: /usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator = om*; _Tp = om; _Compare = int (*)(om&, om&)]’: /usr/include/c++/4.8/bits/stl_algo.h:2319:78: required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = om*; _Compare = int (*)(om&, om&)]’ /usr/include/c++/4.8/bits/stl_algo.h:2360:62: required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = om*; _Size = int; _Compare = int (*)(om&, om&)]’ /usr/include/c++/4.8/bits/stl_algo.h:5513:44: required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = om*; _Compare = int (*)(om&, om&)]’ user.cpp:34:20: required from here /usr/include/c++/4.8/bits/stl_algo.h:2287:35: error: invalid initialization of reference of type ‘om&’ from expression of type ‘const om’ while (__comp(*__first, __pivot)) ^ /usr/include/c++/4.8/bits/stl_algo.h:2290:34: error: invalid initialization of reference of type ‘om&’ from expression of type ‘const om’ while (__comp(__pivot, *__last)) ^