Section 6.6 of The C Programming Language presents a simple dictionary (hashtable) data structure. I don’t think a useful dictionary implementation could get any simpler than this. For your convenience, I reproduce the code here. Note that if the hashes of two strings collide, it may lead to an O(n) lookup time. You can reduce the likelihood of collisions … Read more
A cut of a connected graph is a minimal set of edges whose removal separate the graph into two components (pieces). The minimal cut property says that if one of the edges of the cut has weight smaller than any other edge in the cut then it is in the MST. To see this, assume … Read more
Python includes the heapq module for min-heaps, but I need a max heap. What should I use for a max-heap implementation in Python?
Java definitively has no structs 🙂 But what you describe here looks like a JavaBean kind of class.
There are two reasons you could want to use a tree: You want to mirror the problem using a tree-like structure:For this we have boost graph library Or you want a container that has tree like access characteristics For this we have std::map (and std::multimap) std::set (and std::multiset) Basically the characteristics of these two containers is such that they practically … Read more
Java definitively has no structs 🙂 But what you describe here looks like a JavaBean kind of class.
Note that also you can use boost.ublas for matrix creation and manipulation and also boost.graph to represent and manipulate graphs in a number of ways, as well as using algorithms on them, etc. Edit: Anyway, doing a range-check version of a vector for your purposes is not a hard thing: Note that you would also need to add the … Read more
Partly, because Go doesn’t have generics (so you would need one set-type for every type, or fall back on reflection, which is rather inefficient). Partly, because if all you need is “add/remove individual elements to a set” and “relatively space-efficient”, you can get a fair bit of that simply by using a map[yourtype]bool (and set the value … Read more
It’s easier to store data of different sizes in a linked list. An array assumes every element is exactly the same size. As you mentioned, it’s easier for a linked list to grow organically. An array’s size needs to be known ahead of time, or re-created when it needs to grow. Shuffling a linked list … Read more
Why are the running times of BFS and DFS O(V+E), especially when there is a node that has a directed edge to a node that can be reached from the vertex, like in this example in the following site http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/GraphAlgor/depthSearch.htm