Compilare: user.cpp: In function ‘bool subsir_valid(char*, char*)’: user.cpp:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (i==strlen(x)); ^ user.cpp:14:9: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, lx=strlen(x), ly=strlen(y); ^ user.cpp:14:12: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, lx=strlen(x), ly=strlen(y); ^