I was going to write up my own explanation but this Wikipedia article pretty much sums it up. Here is the basic concept: Copy-on-write (sometimes referred to as “COW”) is an optimization strategy used in computer programming. The fundamental idea is that if multiple callers ask for resources which are initially indistinguishable, you can give them pointers … Read more
To delete a key regardless of whether it is in the dictionary, use the two-argument form of dict.pop(): This will return my_dict[key] if key exists in the dictionary, and None otherwise. If the second parameter is not specified (i.e. my_dict.pop(‘key’)) and key does not exist, a KeyError is raised. To delete a key that is guaranteed to exist, you can also use: This will raise a KeyError if the … Read more
I learned that depth and height are properties of a node: The depth of a node is the number of edges from the node to the tree’s root node.A root node will have a depth of 0. The height of a node is the number of edges on the longest path from the node to a leaf.A leaf node will have a … Read more
Is there any standard Java library class to represent a tree in Java? Specifically I need to represent the following: The sub-tree at any node can have an arbitrary number of children Each node (after the root) and it’s children will have string value I need to get all the children (some sort of list … Read more
Binary tree: Tree where each node has up to two leaves Binary search tree: Used for searching. A binary tree where the left child contains only nodes with values less than the parent node, and where the right child only contains nodes with values greater than or equal to the parent.
I’m very new to C++, and I was wondering if there was a way to make a min heap in C++ from the standard library.
Hash your objects yourself manually, and use the resulting strings as keys for a regular JavaScript dictionary. After all, you are in the best position to know what makes your objects unique. That’s what I do. Example: This way you can control indexing done by JavaScript without heavy lifting of memory allocation, and overflow handling. … Read more
I am trying to construct a General tree. Are there any built-in data structures in Python to implement it?
The key here would be to acquire all the different character combinations that can derive from the characters related to the supplied number in the left to right sequence of that number. Obviously the larger the supplied number, the more combinations there will be. The number of 26678837 which you provided in your post for … Read more
append: Appends object at the end. gives you: [1, 2, 3, [4, 5]] extend: Extends list by appending elements from the iterable. gives you: [1, 2, 3, 4, 5]