随笔分类 -  leetcode

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algorithn
Leetcode 617. 合并二叉树
摘要：题目链接 https://leetcode cn.com/problems/merge two binary trees/description/ 题目描述 给定两个二叉树，想象当你将它们中的一个覆盖到另一个上时，两个二叉树的一些节点便会重叠。 你需要将他们合并为一个新的二叉树。合并的规则是如果两个 阅读全文
posted @ 2018-08-27 11:09 DCREN 阅读(191) 评论(0) 推荐(0)
Leetcode 226. 翻转二叉树
摘要：题目链接 https://leetcode cn.com/problems/invert binary tree/description/ 题目描述 翻转一颗二叉树 示例 输入： 输出： ` 题解 使用递归的方式来求解。需要注意的是，在翻转的过程中，注意保存树节点的一个副本，不然在后面的翻转中会存在 阅读全文
posted @ 2018-08-27 09:39 DCREN 阅读(115) 评论(0) 推荐(0)
Leetcode 654.最大二叉树
摘要：题目链接 https://leetcode cn.com/problems/maximum binary tree/description/ 题目描述 给定一个不含重复元素的整数数组。一个以此数组构建的最大二叉树定义如下： 1. 二叉树的根是数组中的最大元素。 2. 左子树是通过数组中最大值左边部分 阅读全文
posted @ 2018-08-27 09:33 DCREN 阅读(459) 评论(0) 推荐(0)
【Leetcode】413. Arithmetic Slices
摘要：Description A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elem 阅读全文
posted @ 2018-07-31 11:34 DCREN 阅读(186) 评论(0) 推荐(0)
【Leetcode】128. Longest Consecutive Sequence
摘要：Description Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) compl 阅读全文
posted @ 2018-07-30 14:29 DCREN 阅读(147) 评论(0) 推荐(0)
【Leetcode】605. Can Place Flowers
摘要：Description Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent 阅读全文
posted @ 2018-07-30 12:10 DCREN 阅读(218) 评论(0) 推荐(0)
【Leetcode】647. Palindromic Substrings
摘要：Description Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end i 阅读全文
posted @ 2018-07-30 10:43 DCREN 阅读(158) 评论(0) 推荐(0)
【Leetcode】807. Max Increase to Keep City Skyline
摘要：Description In a 2 dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the hei 阅读全文
posted @ 2018-07-27 15:35 DCREN 阅读(255) 评论(0) 推荐(0)
【Leetcode】804. Unique Morse Code Words
摘要：Unique Morse Code Words Description International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, a 阅读全文
posted @ 2018-07-27 14:28 DCREN 阅读(284) 评论(0) 推荐(0)
【Leetcode】709. To Lower Case
摘要：To Lower Case Description Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. Example 1: Examp 阅读全文
posted @ 2018-07-27 12:47 DCREN 阅读(402) 评论(0) 推荐(0)
【Leetcode】Jewels and Stones
摘要：Jewels and Stones Description You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each ch 阅读全文
posted @ 2018-07-27 12:17 DCREN 阅读(205) 评论(0) 推荐(0)

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