Compilare: user.cpp: In function ‘int main()’: user.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(size_t i=0;i<k;i++){ ^ user.cpp:29:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(size_t i=0;i<k;i++){ ^ user.cpp:80:13: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<y; ^ user.cpp:76:13: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<x; ^