Compilare: user.cpp: In function ‘void update(int, int, int)’: user.cpp:21:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (idx <= mid) update(st, mid, pos*2); ^ user.cpp: In function ‘int query(int, int, int)’: user.cpp:28:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l<=st && dr<=r) return h[pos]; ^ user.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l<=st && dr<=r) return h[pos]; ^ user.cpp:32:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l<=mid) left = query(st, mid, 2*pos); ^ user.cpp:33:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r>mid) right = query(mid+1, dr, 2*pos+1); ^ user.cpp: In function ‘int main()’: user.cpp:42:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; i++) { ^ user.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<m; i++) { ^