Compilare: user.cpp: In function ‘int main()’: user.cpp:22:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s)) ^ user.cpp:25:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[j]<s[j-1] && s[j]<s[j+1] && j<strlen(s)) ^