You are given two arrays with positive integers arr1 and arr2.
A prefix of a positive integer is an integer formed by one or more of its digits, starting from its leftmost digit. For example, 123 is a prefix of the integer 12345, while 234 is not.
A common prefix of two integers a and b is an integer c, such that c is a prefix of both a and b. For example, 5655359 and 56554 have a common prefix 565 while 1223 and 43456 do not have a common prefix.
You need to find the length of the longest common prefix between all pairs of integers (x, y) such that x belongs to arr1 and y belongs to arr2.
Return the length of the longest common prefix among all pairs. If no common prefix exists among them, return 0.
\n
Example 1:
\n\n\nInput: arr1 = [1,10,100], arr2 = [1000]\nOutput: 3\nExplanation: There are 3 pairs (arr1[i], arr2[j]):\n- The longest common prefix of (1, 1000) is 1.\n- The longest common prefix of (10, 1000) is 10.\n- The longest common prefix of (100, 1000) is 100.\nThe longest common prefix is 100 with a length of 3.\n\n\n
Example 2:
\n\n\nInput: arr1 = [1,2,3], arr2 = [4,4,4]\nOutput: 0\nExplanation: There exists no common prefix for any pair (arr1[i], arr2[j]), hence we return 0.\nNote that common prefixes between elements of the same array do not count.\n\n\n
\n
Constraints:
\n\n1 <= arr1.length, arr2.length <= 5 * 1041 <= arr1[i], arr2[i] <= 108arr1 into a HashSet.",
"For all the possible prefixes of each element in arr2, check if it exists in the HashSet."
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