随笔分类 -  leetcode

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LeetCode Intersection of Two Linked Lists
摘要：Write a program to find the node at which the intersection of two singly linked lists begins.For example, the following two linked lists:A: a... 阅读全文
posted @ 2014-11-27 22:51 birdhack 阅读(148) 评论(0) 推荐(0)
LeetCode Roman to Integer
摘要：Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999. 1 public class Solution { 2 public int ... 阅读全文
posted @ 2014-11-26 23:52 birdhack 阅读(119) 评论(0) 推荐(0)
LeetCode Integer to Roman
摘要：Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.public class Solution { public String int... 阅读全文
posted @ 2014-11-26 22:39 birdhack 阅读(104) 评论(0) 推荐(0)
LeetCode String to Integer (atoi)
摘要：Implementatoito convert a string to an integer.Hint:Carefully consider all possible input cases. If you want a challenge, please do not see below and ... 阅读全文
posted @ 2014-11-26 00:24 birdhack 阅读(161) 评论(0) 推荐(0)
LeetCode 4Sum
摘要：Given an arraySofnintegers, are there elementsa,b,c, anddinSsuch thata+b+c+d= target? Find all unique quadruplets in the array which gives the sum of ... 阅读全文
posted @ 2014-11-23 21:45 birdhack 阅读(94) 评论(0) 推荐(0)
LeetCode Two Sum
摘要：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 the two nu... 阅读全文
posted @ 2014-11-23 00:31 birdhack 阅读(127) 评论(0) 推荐(0)
LeetCode 3Sum
摘要：Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero.Note:Elemen... 阅读全文
posted @ 2014-11-21 23:34 birdhack 阅读(121) 评论(0) 推荐(0)
leetcode Permutation Sequence
摘要：The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence (ie... 阅读全文
posted @ 2014-11-19 22:18 birdhack 阅读(137) 评论(0) 推荐(0)
leetcode Add Two Numbers
摘要：You 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 ... 阅读全文
posted @ 2014-11-18 20:32 birdhack 阅读(127) 评论(0) 推荐(0)
LeetCode Validate Binary Search Tree
摘要：Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains only n... 阅读全文
posted @ 2014-11-17 13:14 birdhack 阅读(119) 评论(0) 推荐(0)
LeetCode Reverse Linked List II
摘要：Reverse Linked List IIReverse a linked list from positionmton. Do it in-place and in one-pass.For example:Given1->2->3->4->5->NULL,m= 2 andn= 4,return... 阅读全文
posted @ 2014-11-14 22:59 birdhack 阅读(117) 评论(0) 推荐(0)
leetcode Letter Combinations of a Phone Number
摘要：Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon... 阅读全文
posted @ 2014-11-13 21:59 birdhack 阅读(169) 评论(0) 推荐(0)
LeetCode Next Permutation
摘要：Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl... 阅读全文
posted @ 2014-11-12 01:09 birdhack 阅读(131) 评论(0) 推荐(0)
LeetCode Construct Binary Tree from Inorder and Postorder Traversal
摘要：Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.后序遍历的最后一个元素就是根... 阅读全文
posted @ 2014-11-10 23:29 birdhack 阅读(114) 评论(0) 推荐(0)
LeetCode Triangle
摘要：Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the fol... 阅读全文
posted @ 2014-11-09 13:08 birdhack 阅读(140) 评论(0) 推荐(0)
LeetCode Partition List
摘要：Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preserve the origi... 阅读全文
posted @ 2014-11-06 12:28 birdhack 阅读(116) 评论(0) 推荐(0)
LeetCode 3Sum Closest
摘要：Given an arraySofnintegers, find three integers inSsuch that the sum is closest to a given number, target. Return the sum of the three integers. You m... 阅读全文
posted @ 2014-11-05 00:00 birdhack 阅读(144) 评论(0) 推荐(0)
LeetCode Jump Game
摘要：Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximu... 阅读全文
posted @ 2014-11-04 12:36 birdhack 阅读(124) 评论(0) 推荐(0)
LeetCode Convert Sorted List to Binary Search Tree
摘要：Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 1 /** 2 * Definition for singly-linked ... 阅读全文
posted @ 2014-11-03 23:20 birdhack 阅读(116) 评论(0) 推荐(0)
LeetCode Search for a Range
摘要：Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's runtime complexity must be in the ord... 阅读全文
posted @ 2014-11-02 11:42 birdhack 阅读(132) 评论(0) 推荐(0)

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