Compilare: user.cpp: In function ‘int main()’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( i < s.size()){ ^ user.cpp:22:71: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[j] > s[j+1] && s[j+1] < s[j+2] && j + 2 < s.size()) ^ user.cpp:18:17: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int i,j,k; ^ user.cpp:41:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i<s.size(); ++i){ ^