treemap

LinkHashMap是基于HashMap和双向链表来实现的。 HashMap无序，LinkedHashMap有序，可分为插入顺序和访问顺序两种。如果是访问顺序，那put和get操作已存在的Entry时，都会把Entry移动到双向链表的表尾。 如果还需要保证统计性能或者需要对Key按照一定规则进行排序，那么使用treemap是一种更好的选择。 TreeMap为增、删、改、查这些操作提供了log(N)的时间复杂度， 从存储角度而言，这比HashMap与LinkedHashMap的o(1)时间复杂度要差些； 从统计性能上，TreeMap同时可以保证log(N)的时间开销，这又比HashMap和LinkedHashMap的o(N)时间复杂度好不少。 来源： oschina 链接： https://my.oschina.net/u/4045381/blog/3136828

TreeSet和HashSet类似，但是TreeSet是一个有序的集合，内部的排序是使用红黑树完成的，因为排序，所以放入TreeSet集合中的元素都必须实现Comparable接口。 从这个继承层次中我们发现TreeSet也聚合了Map的实现，那么是不是和HashSet一样，调用了Map的实现之后，TreeSet自己就什么都不做了呢，看看TreeSet里面都有什么： /** * The backing map. */ private transient NavigableMap<E,Object> m; /** * Constructs a set backed by the specified navigable map. */ TreeSet(NavigableMap<E,Object> m) { this.m = m; } public TreeSet() { this(new TreeMap<E,Object>()); } // ... more code 从定义的属性和构造函数看，好像是这样的，为了确认，我们再找几个方法看看： public boolean add(E e) { return m.put(e, PRESENT)==null; } public int size() { return m.size(); } public E lower(E e) {

I'm interested in using python to make diagrams representing the size of values based on the size of squares (and optionally their colour). Basically I'm looking for a way to make overviews of a bunch of values like the good old program windirstat does with hard-drive usage (it basically makes a big square representing your harddrive and then smaller squares making up the area inside of it representing different programs, the bigger the square the larger the file, colour indicates the type of file). I'm fairly familiar with matplotlib, and I don't think it's possible to do something like this

I have read many articles on Red black tree where it take O(log n) time for operations .I am not very clear how it works and how actually tree map uses red black tree algorithm to balance the tree compared to binary search tree. Ref Links https://www.topcoder.com/community/data-science/data-science-tutorials/an-introduction-to-binary-search-and-red-black-trees/ Can anyone please explain with a example how the algorithm works. A red-black tree is a binary search tree. It's just a flavor of BST that has fancy versions of insert and delete operations that reorganize the tree as they run so that

I'm wondering if there is a simpler way to restrict the width of a text label than using a clip path. Here's an example of what I'm looking for with regard to labeling: treemap : Notice that the labels get truncated by the boundaries of the containing tiles. That particular example is implemented using <div> tags, which have this behaviour by default. But I'm using SVG <rect> and I'm hoping there is a more straight-forward way of doing this than a separate clip path defining another rect shape. You could wrap each <rect> element in an <svg> element of the same width/height. By default overflow

Most places I've consulted say to use SortedList, but the problem is that the program I'm porting actually uses duplicate keys (differentiated by order), which is permissible with TreeMap, but not SortedList. Any advice? Does SortedDictionary class help? Another great implementation of a Red Black Tree in .NET can be found here: http://www.itu.dk/research/c5/ I don't think C# has one natively. However there are plenty of examples of Red-Black implementations out there. Here is one:- http://www.codeproject.com/KB/recipes/redblackcs.aspx 来源： https://stackoverflow.com/questions/477954/java