Compilare: user.cpp: In function ‘bool verif(char*, char*)’: user.cpp:15:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(b); i++) ^ user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==strlen(a)) ^ user.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==strlen(a)) ^ user.cpp: In function ‘int main()’: user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s[i].rand) > maxLength) ^ user.cpp:65:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s[i].rand) == maxLength) ^ user.cpp:36:23: warning: unused variable ‘k’ [-Wunused-variable] int N,maxLength=0,k=0,p; ^