Pavel and barbecue
Pavel cooks barbecue. There are n skewers, they lay on a brazier in a row, each on one of n positions. Pavel wants each skewer to be cooked some […]
Pavel
Pavel and Triangles
Pavel has several sticks with lengths equal to powers of two. He has $a_0$ sticks of length $2^0 = 1$, $a_1$ sticks of length $2^1 […]
