Our Combination code in C#.
Combination Class File:
using System.Collections.Generic;
namespace Miscellaneous_CS
{
class Combination
{
public List<string> words;
public int r; // min length of word
protected List<string[]> comb_store;
private int i;
public Combination()
{
}
// point of entry
public List<string[]> possibleWordCombinations(List<string> candidates, int size) {
words = candidates;
r = size;
comb_store = new List<string[]>();
i = 0;
// check for conformity
if (r <= 0 || r > words.Count) {
comb_store = new List<string[]>();
}
else if (r == 1) {
for (; i < words.Count; i++) {
comb_store.Add(new string[] { words[i] });
}
}
else {
progressiveCombination();
}
return comb_store;
}
// do combinations for all 'words' element
private void progressiveCombination() {
// single member list
repetitivePairing(new List<string>() {words[i]}, i + 1);
if (i + r <= words.Count) {
// move on to next degree
i++;
progressiveCombination();
}
}
// do all possible combinations for 1st element of this array
private void repetitivePairing(List<string> prefix, int position) {
List<string>[] auxiliary_store = new List<string>[words.Count - position];
for (int j = 0; position < words.Count; position++, j++) {
// check if desired -- r -- size will be realised
if (r - prefix.Count <= words.Count - position) {
auxiliary_store[j] = new List<string>();
auxiliary_store[j].AddRange(prefix);
auxiliary_store[j].Add(words[position]);
if (auxiliary_store[j].Count < r) {
// see to adding next word on
repetitivePairing(auxiliary_store[j], position + 1);
}
else {
comb_store.Add(auxiliary_store[j].ToArray());
}
}
}
}
}
}Main Class:
using System;
using System.Collections.Generic;
namespace Miscellaneous_CS
{
class Program
{
static void Main(string[] args)
{
List<string> goods;
goods = new List<string>() { "Eno", "Chidi", "Olu", "Ahmed", "Osas", "Gbeda" };
Combination combo = new Combination();
List<string[]> result = combo.possibleWordCombinations(goods, 3);
// print choices and operation
Console.Write("[ ");
foreach (string choice in combo.words)
{
Console.Write(choice + "; ");
}
Console.WriteLine("] combination " + combo.r + ":" + Environment.NewLine);
// print out combinations nicely
int i = 0;
foreach (string[] set in result)
{
Console.Write(++i + ": ");
foreach (string member in set)
{
Console.Write(member + "; ");
}
Console.WriteLine();
}
Console.WriteLine(Environment.NewLine + "Number of ways is " + result.Count + ".");
}
}
}Try it out!
Elegance (0.0)
