Space (not time) efficient. You could: 1) Define two stacks beginning at the array endpoints and growing in opposite directions. 2) Define the third stack as starting in the middle and growing in any direction you want. 3) Redefine the Push op, so that when the operation is going to overwrite other stack, you shift …
I believe in this case it is best to just use a flat file where each word stands in one line. With this you can conveniently use the power of a regular expression search, which is highly optimized and will probably beat any data structure you can devise yourself for this problem. Solution #1: Using …
var list = new List<int>(new[] { 1, 2, 4, 7, 9 }); var result = Enumerable.Range(0, 10).Except(list);
Since you asked for an algorithm and not an application, take a look at “The String-to-String Correction Problem with Block Moves” by Walter Tichy. There are others, but that’s the original, so you can look for papers that cite it to find more. The paper cites Paul Heckel’s paper “A technique for isolating differences between …
I just came here looking for the same answer. After shuddering at the thought of so much math involved, I thought I would resort to a semi-educated guess. Doodling a bit I came to the (intuitive and probably not entirely exact) conclusion that the largest rectangle is proportional to the outer resulting rectangle, and its …
There are multiple ways of implementing set (and map) functionality, for example: tree-based approach (ordered traversal) hash-based approach (unordered traversal) Since you mentioned value-indexed arrays, let’s try the hash-based approach which builds naturally on top of the value-indexed array technique. Beware of the advantages and disadvantages of hash-based vs. tree-based approaches. You can design a …
I believe what you’re looking for is called a Locality Sensitive Hash. Whereas most hash algorithms are designed such that small variations in input cause large changes in output, these hashes attempt the opposite: small changes in input generate proportionally small changes in output. As others have mentioned, there are inherent issues with forcing a …
The cmp_to_key method returns a special object that acts as a surrogate key: class K(object): __slots__ = [‘obj’] def __init__(self, obj, *args): self.obj = obj def __lt__(self, other): return mycmp(self.obj, other.obj) < 0 def __gt__(self, other): return mycmp(self.obj, other.obj) > 0 def __eq__(self, other): return mycmp(self.obj, other.obj) == 0 def __le__(self, other): return mycmp(self.obj, other.obj) …
There’s no one answer to this but large worlds are often space-partitioned by using something along the lines of a quadtree or kd-tree which brings search times for finding nearest neighbors below linear time (fractional power, or at worst O( N^(2/3) ) for a 3D game). These methods are often referred to as BSP for …
This is something I have been considering in my own research, and I’d say there are many reasons: The vast majority of research in the GP field has focused on producing formulas rather than the sort of software that gets produced by most programmers. There are plenty of computer scientists in the field, but very …