Compilare: user.cpp: In function ‘void update_aib(int, int, int)’: user.cpp:25:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;k<ait[ind].aib.size();k+=(k^(k-1))&k) ^ user.cpp: In function ‘void query_ait(int, int, int, int, int, int)’: user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(0<=p && p<ait[k].l.size() && ait[k].l[p]==val) ok=1; ^