飘落的树叶

摘要：Description:You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways c... 阅读全文

摘要：Description:GivennumRows, generate the firstnumRowsof Pascal's triangle.For example, givennumRows= 5,Return[ [1], [1,1], [1,2,1], [1,3,3,1],... 阅读全文

摘要：Description:Implement pow(x, n)大意：实现pow(x, n)，即通常所说的x的n次方。分析：真是一道很考验人的题目，看似简单，其实有非常多的细节要注意：1）由于x及返回值都是浮点数(double)，那么许多自定义的变量、返回值都尽量使用#.0f的方式定义与实现，显得正式... 阅读全文

摘要：Description:Given a linked list, swap every two adjacent nodes and return its head.For example,Given1->2->3->4, you should return the list as2->1->4->... 阅读全文

摘要：Description:The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integernrepresenting the ... 阅读全文

摘要：Description:Given two sorted integer arrays A and B, merge B into A as one sorted array.Note:You may assume that A has enough space (size that is grea... 阅读全文