Rechard_chen的专栏

Problem Description 从三个元素的集合[A,B,C]中选取元素生成一个N个字符组成的序列，使得没有两个相邻字的子序列(子序列长度=2)相同。例：N=5时ABCBA是合格的，而序列ABCBC与ABABC是不合格的，因为其中子序列BC，AB是相同的。 对于由键盘输入的N(1 Input 输入有多组数据，每组数据只有一行为一个整数N。 Output 对于

Description John has n tasks to do. Unfortunately, the tasks are not independent and the execution of one task is only possible if other tasks have already been executed. Input The input wi

Description American Carnival Makers Inc. (ACM) has a long history of designing rides and attractions. One of their more popular attractions is a fun house that includes a room of mirrors. Their

Description Michael喜欢滑雪百这并不奇怪， 因为滑雪的确很刺激。可是为了获得速度，滑的区域必须向下倾斜，而且当你滑到坡底，你不得不再次走上坡或者等待升降机来载你。Michael想知道载一个区域中最长底滑坡。区域由一个二维数组给出。数组的每个数字代表点的高度。下面是一个例子  1 2 3 4 5 16 17 18 19 6 15 24 25 20 7 14