随笔分类 -  leetcode

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Flatten Binary Tree to Linked List ——LeetCode
摘要：Given a binary tree, flatten it to a linked list in-place.For example,Given 1 / \ 2 5 / \ \ 3 4 6The flattened t... 阅读全文
posted @ 2015-04-13 20:36 丶Blank 阅读(116) 评论(0) 推荐(0)
Generate Parentheses——LeetCode
摘要：Givennpairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, givenn= 3, a solution set is:"((()))... 阅读全文
posted @ 2015-04-13 20:13 丶Blank 阅读(163) 评论(0) 推荐(0)
Binary Search Tree Iterator——LeetCode
摘要：Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.Callingnext()will return the next... 阅读全文
posted @ 2015-04-13 19:53 丶Blank 阅读(140) 评论(0) 推荐(0)
Triangle——LeetCode
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 @ 2015-04-09 16:03 丶Blank 阅读(135) 评论(0) 推荐(0)
Best Time to Buy and Sell Stock II ——LeetCode
摘要：Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a... 阅读全文
posted @ 2015-04-09 12:15 丶Blank 阅读(147) 评论(0) 推荐(0)
Best Time to Buy and Sell Stock——LeetCode
摘要：Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one transaction (ie... 阅读全文
posted @ 2015-04-09 00:36 丶Blank 阅读(129) 评论(0) 推荐(0)
Number of Islands——LeetCode
摘要：Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen 阅读全文
posted @ 2015-04-09 00:04 丶Blank 阅读(765) 评论(0) 推荐(0)
Longest Palindromic Substring——LeetCode
摘要：Given a stringS, find the longest palindromic substring inS. You may assume that the maximum length ofSis 1000, and there exists one unique longest pa... 阅读全文
posted @ 2015-04-08 00:31 丶Blank 阅读(182) 评论(0) 推荐(0)
4Sum——LeetCode
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 @ 2015-04-08 00:24 丶Blank 阅读(150) 评论(0) 推荐(0)
Word Ladder——LeetCode
摘要：Given two words (startandend), and a dictionary, find the length of shortest transformation sequence fromstarttoend, such that:Only one letter can be ... 阅读全文
posted @ 2015-04-06 19:49 丶Blank 阅读(219) 评论(0) 推荐(0)
Letter Combinations of a Phone Number——LeetCode
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 @ 2015-04-06 15:02 丶Blank 阅读(128) 评论(0) 推荐(0)
Sum Root to Leaf Numbers——LeetCode
摘要：Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number.An example is the root-to-leaf path1->2->3which rep... 阅读全文
posted @ 2015-04-05 23:17 丶Blank 阅读(115) 评论(0) 推荐(0)
Search a 2D Matrix ——LeetCode
摘要：Write an efficient algorithm that searches for a value in anmxnmatrix. This matrix has the following properties:Integers in each row are sorted from l... 阅读全文
posted @ 2015-04-05 20:47 丶Blank 阅读(268) 评论(0) 推荐(0)
Surrounded Regions——LeetCode
摘要：Given a 2D board containing'X'and'O', capture all regions surrounded by'X'.A region is captured by flipping all'O's into'X's in that surrounded region... 阅读全文
posted @ 2015-04-05 18:57 丶Blank 阅读(270) 评论(0) 推荐(0)
Palindrome Partitioning——LeetCode
摘要：Given a strings, partitionssuch that every substring of the partition is a palindrome.Return all possible palindrome partitioning ofs.For example, giv... 阅读全文
posted @ 2015-04-05 15:25 丶Blank 阅读(127) 评论(0) 推荐(0)
Reverse Linked List II——LeetCode
摘要：Reverse 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,return1->4->3->2->5->NULL.No... 阅读全文
posted @ 2015-04-05 11:22 丶Blank 阅读(125) 评论(0) 推荐(0)
Word Break II——LeetCode
摘要：Given a stringsand a dictionary of wordsdict, add spaces insto construct a sentence where each word is a valid dictionary word.Return all such possibl... 阅读全文
posted @ 2015-04-03 14:52 丶Blank 阅读(217) 评论(0) 推荐(0)
3Sum Closest——LeetCode
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 @ 2015-03-31 23:45 丶Blank 阅读(136) 评论(0) 推荐(0)
House Robber——LeetCode
摘要：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo... 阅读全文
posted @ 2015-03-31 23:36 丶Blank 阅读(290) 评论(0) 推荐(0)
Clone Graph——LeetCode
摘要：Clone an undirected graph. Each node in the graph contains alabeland a list of itsneighbors.OJ's undirected graph serialization:Nodes are labeled uniq... 阅读全文
posted @ 2015-03-31 00:34 丶Blank 阅读(189) 评论(0) 推荐(0)

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