~每天进步一点点~

2015年8月8日

摘要： Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9to 4 / \ 7 2 / \ / \9 6 3 1/** * Definition for a binary tree node... 阅读全文

posted @ 2015-08-08 14:16 ~每天进步一点点~ 阅读(88) 评论(0) 推荐(0) 编辑

[leedcode 225] Implement Stack using Queues

摘要： Implement the following operations of a stack using queues.push(x) -- Push element x onto stack.pop() -- Removes the element on top of the stack.top()... 阅读全文

posted @ 2015-08-08 14:04 ~每天进步一点点~ 阅读(123) 评论(0) 推荐(0) 编辑

[leedcode 224] Basic Calculator

摘要： Implement a basic calculator to evaluate a simple expression string.The expression string may contain open(and closing parentheses), the plus+or minus... 阅读全文

posted @ 2015-08-08 13:17 ~每天进步一点点~ 阅读(204) 评论(0) 推荐(0) 编辑

2015年8月7日

[leedcode 223] Rectangle Area

摘要： Find the total area covered by tworectilinearrectangles in a2Dplane.Each rectangle is defined by its bottom left corner and top right corner as shown ... 阅读全文

posted @ 2015-08-07 23:22 ~每天进步一点点~ 阅读(107) 评论(0) 推荐(0) 编辑

[leedcode 222] Count Complete Tree Nodes

摘要： Given acompletebinary tree, count the number of nodes.Definition of a complete binary tree fromWikipedia:In a complete binary tree every level, except... 阅读全文

posted @ 2015-08-07 23:08 ~每天进步一点点~ 阅读(173) 评论(0) 推荐(0) 编辑

[leedcode 221] Maximal Square

摘要： Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area.For example, given the following matr... 阅读全文

posted @ 2015-08-07 20:12 ~每天进步一点点~ 阅读(141) 评论(0) 推荐(0) 编辑

2015年8月6日

[219] Contains Duplicate II

摘要： Given an array of integers and an integerk, find out whether there there are two distinct indicesiandjin the array such thatnums[i] = nums[j]and the d... 阅读全文

posted @ 2015-08-06 23:08 ~每天进步一点点~ 阅读(114) 评论(0) 推荐(0) 编辑

[leedcode 218] The Skyline Problem

摘要： A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose you aregiven... 阅读全文

posted @ 2015-08-06 22:57 ~每天进步一点点~ 阅读(169) 评论(0) 推荐(0) 编辑

[leedcode 217] Contains Duplicate

摘要： Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the arr... 阅读全文

posted @ 2015-08-06 22:12 ~每天进步一点点~ 阅读(107) 评论(0) 推荐(0) 编辑

[leedcode 216] Combination Sum III

摘要： Find all possible combinations ofknumbers that add up to a numbern, given that only numbers from 1 to 9 can be used and each combination should be a u... 阅读全文

posted @ 2015-08-06 21:17 ~每天进步一点点~ 阅读(117) 评论(0) 推荐(0) 编辑

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