How to Find All Combinations of Array Items in C#?

How to find array element combinations in C#

Finding the combination of all elements in an array is a common task in various programming scenarios. Here are a few ways to achieve this in C#:

Arrangement with repeated elements: This method allows duplicates to be used in combinations. A generic function "GetPermutationsWithRept" has been provided to generate permutations with repeated elements for a given array.

Arrangement: This method prohibits the use of duplicates in the combination. A generic function "GetPermutations" has been provided to handle this situation.

K combination with repeated elements: This method allows duplicates to be included in combinations of length 'k'. A generic function "GetKCombsWithRept" is designed for this purpose.

K combination: Similar to K combinations with repeated elements, this method generates combinations of length 'k', but duplicates are prohibited. A generic function "GetKCombs" has been provided to perform this task.

Output: For the given input array [1, 2, 3, 4] and length 2, the output is as follows:

Arrangement with repeated elements: {1,1} {1,2} {1,3} {1,4} {2,1} {2,2} {2,3} {2,4} {3,1} {3,2} {3,3} {3,4} {4,1} {4,2} {4,3} {4,4}

Arrangement: {1,2} {1,3} {1,4} {2,1} {2,3} {2,4} {3,1} {3,2} {3,4} {4,1} {4,2} {4,3}

K combination with repeated elements: {1,1} {1,2} {1,3} {1,4} {2,2} {2,3} {2,4} {3,3} {3,4} {4,4}

K combination: {1,2} {1,3} {1,4} {2,3} {2,4} {3,4}

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