Compilare: user.cpp: In function ‘void update_h(int, int, std::vector<char>)’: user.cpp:35:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i){ ^ user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j+i<s.size();++j){ ^ user.cpp: In function ‘void make(int)’: user.cpp:53:13: warning: unused variable ‘ind’ [-Wunused-variable] int ind=0; ^ user.cpp: In function ‘int main()’: user.cpp:82:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<s.size();++j){ ^