Store all prefixes of numbers from arr1 in a HashSet. Example for 12345: 12345 1234 123 12 1 We...
Store all prefixes of numbers from arr1 in a HashSet.
Example for 12345:
We get these prefixes by repeatedly dividing by 10.
Then for every number in arr2, keep removing digits from the end and check if that prefix exists in the set.
Example:
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