Compilare: user.cpp: In function ‘void update_h(int, int)’: user.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m.size();++i){ ^ user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j+i<m.size();++j){ ^ user.cpp: In function ‘void make(int)’: user.cpp:54:13: 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){ ^