Compilare: user.cpp: In function ‘int main()’: user.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i <= s.size() - 1; ++ i ) ^ user.cpp:36:5: warning: unused variable ‘sol’ [-Wunused-variable] int sol = (s.size() - 1) - K * res ; ^