Compilare: user.cpp: In function ‘int main()’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v.size(); ++j) ^ user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < v.size(); ++k) ^ user.cpp:38:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); ++i) ^ user.cpp:35:23: warning: ‘poz2’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(v[poz1], v[poz2]); ^ user.cpp:35:14: warning: ‘poz1’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(v[poz1], v[poz2]); ^