2014年10月17日
[Leetcode] Climbing Stairs
摘要： 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 can you climb... 阅读全文
posted @ 2014-10-17 15:19 Phoebe815 阅读(128) 评论(0) 推荐(0)
[Leetcode] Linked List Cycle II
摘要： Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull.Follow up:Can you solve it without using extra space?Sol... 阅读全文
posted @ 2014-10-17 15:01 Phoebe815 阅读(111) 评论(0) 推荐(0)
[Leetcode] Linked List Cycle
摘要： Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?Solution:快慢指针。 1 /** 2 * Definition for s... 阅读全文
posted @ 2014-10-17 14:20 Phoebe815 阅读(99) 评论(0) 推荐(0)
[Leetcode] Unique Binary Search Trees II
摘要： Givenn, generate all structurally uniqueBST's(binary search trees) that store values 1...n.For example,Givenn= 3, your program should return all 5 uni... 阅读全文
posted @ 2014-10-17 14:10 Phoebe815 阅读(130) 评论(0) 推荐(0)