Compilare: user.cpp: In function ‘bool verif(int)’: user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n;i<strlen(x);i++) ^ user.cpp: In function ‘int frum(int)’: user.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(x)-n+1<=k) ^ user.cpp:81:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(x)-(n+1)>k) ^