Compilare: user.cpp: In function ‘int count(int)’: user.cpp:49:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+step<=ait[k].size()-1) ^ user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+step<=ait[k].size()-1 && ait[k][i+step]<=pr.y) ^ user.cpp:59:13: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] return r-l+1; ^ user.cpp: In function ‘void solve()’: user.cpp:92:32: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol=0; query(1,1,n,l,r); ^