Question 4

Design a data structure that supports kind of full text search but in numbers.

We are given file with lot of 10-digits numbers, for example:

1234 567 890

4124 123 123

3123 123 322

On a given number X we should return all numbers that contain X.

For example, if the number 123 was given, we should return all numbers (from the list above) because 123 is in all of them.

If the number 41 was given we should return only the middle number – because the number 41 is only in it.

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