Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:33: warning: comparison between signed and unsigned integer expressions user.cpp:39: error: call of overloaded ‘abs(size_t)’ is ambiguous /usr/include/stdlib.h:766: note: candidates are: int abs(int) /usr/include/c++/4.4/cmath:102: note: long double std::abs(long double) /usr/include/c++/4.4/cmath:98: note: float std::abs(float) /usr/include/c++/4.4/cmath:94: note: double std::abs(double) /usr/include/c++/4.4/cstdlib:170: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.4/cstdlib:139: note: long int std::abs(long int)