Given a string, sort it in decreasing order based on the frequency of characters.

Example 1:

Input:
"tree" Output:
"eert" Explanation:
'e' appears twice while 'r' and 't' both appear once.
So 'e' must appear before both 'r' and 't'. Therefore "eetr" is also a valid answer.

Example 2:

Input:
"cccaaa" Output:
"cccaaa" Explanation:
Both 'c' and 'a' appear three times, so "aaaccc" is also a valid answer.
Note that "cacaca" is incorrect, as the same characters must be together.

Example 3:

Input:
"Aabb" Output:
"bbAa" Explanation:
"bbaA" is also a valid answer, but "Aabb" is incorrect.
Note that 'A' and 'a' are treated as two different characters.
 这题主要是考对数据结构的应用。首先需要用HashMap对字符进行出现次数的整理,其次要将HashMap放入List中进行排序。

Sort Characters By Frequency的更多相关文章

  1. 【leetcode】451. Sort Characters By Frequency

    Given a string s, sort it in decreasing order based on the frequency of the characters. The frequenc ...

  2. [LeetCode] Sort Characters By Frequency 根据字符出现频率排序

    Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: ...

  3. 451. Sort Characters By Frequency

    题目: Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Inp ...

  4. Leetcode: Sort Characters By Frequency

    Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: ...

  5. [Swift]LeetCode451. 根据字符出现频率排序 | Sort Characters By Frequency

    Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: ...

  6. 451. Sort Characters By Frequency将单词中的字母按照从高频到低频的顺序输出

    [抄题]: Given a string, sort it in decreasing order based on the frequency of characters. Example 1: I ...

  7. Heap-451. Sort Characters By Frequency

    Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: ...

  8. #Leetcode# 451. Sort Characters By Frequency

    https://leetcode.com/problems/sort-characters-by-frequency/ Given a string, sort it in decreasing or ...

  9. 451. Sort Characters By Frequency (sort map)

    Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: ...

随机推荐

  1. CMD 规范是不是就是 commonJS 规范?

    作者:giscafer链接:https://www.zhihu.com/question/20576942/answer/58094030来源:知乎著作权归作者所有,转载请联系作者获得授权. CMD是 ...

  2. VS2010+Qt+OpenCv(显示图像)

    Qt在界面显示窗口中起着越来越重要的作用,从而了解了下如何在Qt中显示一副图像. 该小程序主要注意一下几点: 1.工程属性中设置OpenCV的环境(包含目录和库目录,以及附加依赖项),设置Qt的环境( ...

  3. IaaS/PaaS/SaaS

    如果你是一个网站站长,想要建立一个网站.不采用云服务,你所需要的投入大概是:买服务器,安装服务器软件,编写网站程序.现在你追随潮流,采用流行的云计算,如果你采用IaaS服务,那么意味着你就不用自己买服 ...

  4. flask笔记1-安装

    1.创建应用的根目录: 2.在根目录下创建独立的虚拟python运行环境,创建完成后当前目录会有一个文件夹,即该独立环境(使用--no-site-pachages参数将不会复制任何系统python环境 ...

  5. H5 学习笔记(一、关于position定位)

    主要是relative与absolute的用法: 1.relative 依据left right top bottom 等属性在正常文档流中脱离位置,即相对于他的正常文档流位置进行移动.两个都为rel ...

  6. C语言课程学习的总结

    C语言课程学习的总结 学习C程序这门课一年了,这是我们学的第一门专业课.在大学里,C语言不但是计算机专业的必修课程而且也是非计算机专业学习计算机基础的一门必修课程.所以作为我这个计算机专业的学生来说当 ...

  7. Oracle一个事务中的Insert和Update执行顺序

    今天碰到了一个奇怪的问题,是关于Oracle一个事务中的Insert和Update语句的执行顺序的问题. 首先详细说明下整个过程: 有三张表:A,B,C,Java代码中有一段代码是先在表A中插入一条数 ...

  8. 解决xftp远程连接中文乱码

    更改乱码服务器的属性,使用UTF-8编码

  9. Install Atom editor in ubuntu 14.04

    Step 1: Add repository sudo add-apt-repository ppa:webupd8team/atom Step 2: Update the repository su ...

  10. 使用ajaxfileupload.js实现文件上传

    ajaxFileUpload是一个异步上传文件的jQuery插件 语法:$.ajaxFileUpload([options]) options参数说明: 1.url  上传处理程序地址. 2,file ...