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Dereference of a possibly null reference.

Dereference of a possibly null reference.

Nullability of reference types in return type of 'IEnumerable<int>? TwoSum.HussyDryRun(int[] n, int t)' doesn't match the target delegate 'TwoSum.TestFunction' (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.