Compilare: user.cpp: In function ‘bool subs(char*, char*)’: user.cpp:17:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(a)) ^ user.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==strlen(b))return true; ^ user.cpp: In function ‘int main()’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s[i])>lmax || (strlen(s[i])==lmax && strcmp(s[i], s[imax])<0)) ^ user.cpp:38:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s[i])>lmax || (strlen(s[i])==lmax && strcmp(s[i], s[imax])<0)) ^ user.cpp:48:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(strlen(s[i])>strlen(s[j])) ^