This is primarily intended as personal reminder, however, anyone who likes to can use them.
The code is provided as is, with no guarantee of correctness. Do not hold me liable if it does not work correctly in your application.
I'll be happy to collect code improvements; a new code is an improvement if:
- it does a better job;
- it does the same job but using fewer lines of simple code (KISS programming!).

General algorithms

• Index-based quicksort (or Array.Sort(ind, (a,b)-> col[a].CompareTo(col[b])) )
• Very basic backpropagation code for feedforward neural networks
• A simple montecarlo extraction, real values
• 2 opt for asymmetric TSP
• 3 opt for symmetric TSP
• 2 opt on nodes for symmetric TSP (not too bright)
• A class for TSP local optimization
• A simple Dijkstra, PQ as an array
• A much better Dijkstra, PQ as chained hash (buckets)
• Another good Dijkstra, porting of splib's dikh (PQ as heap)
• Rough porting of Taillard's ts for the qap (Quadratic Assignment Problem)
• Rough porting of Bertsekas' Relax for min cost network flow
• Counting the number of bits set to 1 in a longint
• To sequentially generate all permutations of an int array (Knuth)
• Linear assignment, Hungarian, or LSAP (my porting of burkard's LSAP) or LAP

Graphics

• Making an image persistent

MILP

• All different binary variables
• Absolute values
• A basic VS2013 c# project using cplex in a c++ dll

Databases

• Loading a MS Access table by means of a DataReader
• To show a (SqLite)table on a WPF listview
• To read an integer array from a SQL table via LINQ, no dataset
• To read an integer array from a SQL table via datareader, no extra structures
• To select the median of the values of a field
• A bare VS2012 project for SpatiaLite 32 bit
• SQlite: to update values in a table reading them from another table (update from)

Other

• Environment variables, application default directories
• Deep copy of a generic .net object
• Copy a jagged array into a new one, one line
• Dialog form for choosing the file to open (either Form or WPF)
• For directing the standard trace to a textBox (Windows forms). Here MyTraceListner class
• For starting an exe as a process
• For launching a python script (almost the same as the one above, but you know ...)
• For enumerating all subsets of a given set (in LINQ)
• Serializing and deserializing an object on a binary file
• Starting a thread as a background worker
// trucchetto per fare lista con tipo solo interno al metodo (non definisco una classe solo per questa lista) var lstResults = new[] { new { idScen = -1, numPicks = -1, numMoves = -1 } }.ToList(); // lista con elemento dummy lstResults.Clear(); // tolgo l'elemento dummy ma resta la lista con struttura

GIS

• MapServer: how to have labels which follow a line geometry (street names on street arcs)
• For launcing MapServer from c#
• To compute the distance in meters given latitude and longitude (SRID 3003) of the endpoints
• To compute the distance in meters given latitude and longitude (SRID 4326) of the endpoints
• To generate a geometry point given given latitude and longitude
• To update the SRID of a whole geometry column given lat and lng
• To load a kml file into SpatiaLite (via ogr, otherwise GeomFromKml(KmlGeometry String))
• To load spatialite in a c# solution

ANSI C / C++

• Utility functions (exepath, split and trim, so far)
• Passing a parameter by ref
• Example using SuperEasyJson for serializing / deserializing a memory complex object
• A Code::Blocks C++ project for using SpatiaLite 4.2.0 (on windows 8.1) .