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What are the advantages of using a schema-free database like MongoDB compared to a relational databa
... often represent in a single entity a construct that would require several tables to properly represent in a relational db. This is especially useful if your data is immutable.
Deep query-ability. MongoDB supports dynamic queries on documents using a document-based query language that's nearly as po...
How Scalable is SQLite? [closed]
...g edits and realize that there are ways of speeding up SQLite to have acceptable performance.
– Kyle Cronin
Jul 23 '09 at 17:03
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What is better, adjacency lists or adjacency matrices for graph problems in C++?
...e can improve the space-efficiency of the adjacency matrix by using a hash table where the keys are pairs of vertices (undirected only).
Iteration and lookup
Adjacency lists are a compact way of representing only existing edges. However, this comes at the cost of possibly slow lookup of specific e...
Detecting when the 'back' button is pressed on a navbar
...s run through an example. Say you have three view controllers:
ListVC: A table view of things
DetailVC: Details about a thing
SettingsVC: Some options for a thing
Lets follow the calls on the detailVC as you go from the listVC to settingsVC and back to listVC
List > Detail (push detailVC) De...
Image comparison - fast algorithm
I'm looking to create a base table of images and then compare any new images against that to determine if the new image is an exact (or close) duplicate of the base.
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Returning 'IList' vs 'ICollection' vs 'Collection'
...of the items and this order could change at any time, if the internal hash table is re-organized.
– Olivier Jacot-Descombes
Jan 2 '15 at 17:07
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How does this giant regex work?
...PHP to see the corresponding output, or look up each character in an ASCII table
– Michael Mrozek
Jul 25 '10 at 6:14
@...
Finding all cycles in a directed graph
...ind a valid route, it depends on your data structure. For me it was a sql table full of valid route possibilities so I had to build a query to get the valid destinations given a source.
Problem 2)
Push each node as you find them into a collection as you get them, this means that you can see if you...
Generating a UUID in Postgres for Insert statement?
...oint of my comment, though. Your original answer implies that v4 is not suitable for large datasets due to a higher probability of collision than v1. This is misleading and possibly false, though it is hard to calculate the collision probability for v1 because it is so implementation-dependent.
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How do you rotate a two dimensional array?
...overall matrix:
+-----+--------+------------------+
| N×N | Layers | Rotatable Layers |
+-----+--------+------------------+
| 1×1 | 1 | 0 |
| 2×2 | 1 | 1 |
| 3×3 | 2 | 1 |
| 4×4 | 2 | 2 |
| 5×5 | 3 | ...