2016年7月4日
15. 3Sum & 4Sum
摘要： 3 Sum Given an array S of n integers, are there elements a, b, c in Ssuch that a + b + c = 0? Find all unique triplets in the array which gives the su 阅读全文
posted @ 2016-07-04 07:24 北叶青藤 阅读(241) 评论(0) 推荐(0)
Two Sum I & II & III & IV
摘要： Two Sum I Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of 阅读全文
posted @ 2016-07-04 07:13 北叶青藤 阅读(328) 评论(0) 推荐(0)
46, 47. Permutations | & II
摘要： Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the following permutations: [ [1,2,3], [1,3,2], [2, 阅读全文
posted @ 2016-07-04 05:29 北叶青藤 阅读(244) 评论(0) 推荐(0)
First Position of Target
摘要： For a given sorted array (ascending order) and a target number, find the first index of this number in O(log n) time complexity. If the target number 阅读全文
posted @ 2016-07-04 01:22 北叶青藤 阅读(250) 评论(0) 推荐(0)
2016年7月3日
Linked List Cycle | & ||
摘要： Given a linked list, determine if it has a cycle in it. Given a linked list, determine if it has a cycle in it. Given a linked list, determine if it h 阅读全文
posted @ 2016-07-03 11:45 北叶青藤 阅读(198) 评论(0) 推荐(0)
143. Reorder List
摘要： Given a singly linked list L: L0 → L1 → … → Ln-1 → Ln reorder it to: L0 → Ln → L1 → Ln-1 → L2 → Ln-2 → … Example Given 1->2->3->4->null, reorder it to 阅读全文
posted @ 2016-07-03 10:33 北叶青藤 阅读(177) 评论(0) 推荐(0)
148. Sort List
摘要： Sort a linked list in O(n log n) time using constant space complexity. Example Given 1->3->2->null, sort it to 1->2->3->null. Merge Sort version 1 /** 阅读全文
posted @ 2016-07-03 10:24 北叶青藤 阅读(188) 评论(0) 推荐(0)
Partition List
摘要： Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the 阅读全文
posted @ 2016-07-03 08:03 北叶青藤 阅读(175) 评论(0) 推荐(0)
92. Reverse Linked List | & ||
摘要： Reverse Linked List I Reverse a linked list. Example For linked list 1->2->3, the reversed linked list is 3->2->1 分析： 典型的3 pointers 问题。 1 /** 2 * Defi 阅读全文
posted @ 2016-07-03 07:32 北叶青藤 阅读(194) 评论(0) 推荐(0)
138. Copy List with Random Pointer
摘要： A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文
posted @ 2016-07-03 06:55 北叶青藤 阅读(181) 评论(0) 推荐(0)