Compilare: user.cpp: In function ‘void make_tr(int, int, int)’: user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l1 < tr[first].size() || l2 < tr[second].size()) { ^ user.cpp:19:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l1 < tr[first].size() || l2 < tr[second].size()) { ^ user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l1 == tr[first].size()) { ^ user.cpp:22:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if (l2 == tr[second].size()) { ^ user.cpp: In function ‘void query(int, int, int)’: user.cpp:38:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (now + cnt < tr[node].size() && tr[node][now + cnt] < x) { ^ user.cpp:46:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (now + cnt < tr[node].size() && tr[node][now + cnt] <= y) { ^