碧海恋天的博客

Add Two NumbersYou are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers

AnagramsGiven an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.什么是anagrams？/** 整理的提交代码 * 处理复杂度为O(n)，n是字符串个数，但是其中有排序等步骤没有固

Climbing StairsYou are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?/** 整理的