摘要：
Given two stringssandt, determine if they are isomorphic.Two strings are isomorphic if the characters inscan be replaced to gett.All occurrences of a ... 阅读全文
摘要：
Returning null + removing operations:poll(),pollFirst().Returning null + not removing operations:peek(),peekFirst().Throwing exception + removing oper... 阅读全文
摘要：
Numbers can be regarded as product of its factors. For example,8 = 2 x 2 x 2; = 2 x 4.Write a function that takes an integernand return all possible ... 阅读全文