摘要： StaircasesTime Limit: 1.0 second Memory Limit: 16 MBOne curious child has a set of N little bricks (5 ≤ N ≤ 500). From these bricks he builds different staircases. Staircase consists of steps of different sizes in a strictly descending order. It is not allowed for staircase to have steps equal sizes 阅读全文

摘要： K-based NumbersTime Limit: 1.0 secondMemory Limit: 16 MBLet’s consider K-based numbers, containing exactly N digits. We define a number to be valid if its K-based notation doesn’t contain two successive zeros. For example:1010230 is a valid 7-digit number;1000198 is not a valid number;0001235 is not 阅读全文