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Problem Description 现在给你n个不同的数，a1，a2，a3， ..... ，an。求长度为k的不同递减序列的个数，既包含连续也包含不连续的序列。 例如：给你n=3，k=2，原始序列为 3 ，1，2 。长度为2的递减序列为3，1和3，2； 一共有两组所以答案为2. Input 第一行输入n,k(1<=n<=20000, 2=<k<=10)...

Ibraheem and Husam are playing a game with group of boxes, lined next to each other on a straight line, such that each box contains a card with some value written on it. Ibraheem and Husam already kn...