摘要：
>Given a list of non negative integers, arrange them such that they form the largest number.>For example, given [3, 30, 34, 5, 9], the largest formed ... 阅读全文
摘要：
>Given an integer, write a function to determine if it is a power of two.这是计算数中1的个数的简版，如果是2的幂的话，二进制中应该只有一个bit为1，即1的count=1。所以这里就不需要用循环了，一次判断即可。但是入参是有符... 阅读全文