Compilare: user.cpp: In function ‘int main()’: user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);++i) ^ user.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==strlen(s)) ^ user.cpp:25:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x+len[(int)s[k]]+3<=L&&k<strlen(s)) ^