Merge pull request #48 from tobbie/tobbie-patch-2 · tobbie/c-sharp-algorithms@15bcac8

The field 'PowerSet.SetLength' is never used

Cannot convert null literal to non-nullable reference type.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'node' in 'void LFUCache.EvictItem(LinkedListNode<Item> node)'.

Non-nullable property 'First' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Second' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable field 'left' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'right' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference return.

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