所谓子序列，就是在原序列里删掉若干个元素后剩下的序列，以字符串"abcdefg"为例子，去掉bde得到子序列"acfg"

此程序可求出它最长的单调递增子序列。

-The so-called sub-sequences, that is deleted in the original sequence in a number of elements remaining after the sequence to the string　abcdefg , for example, be removed BDE sequence　acfg　This program can be obtained it the longest monotonically increasing sequence .