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] <= 108给你两个 正整数 数组 arr1 和 arr2 。
正整数的 前缀 是其 最左边 的一位或多位数字组成的整数。例如，123 是整数 12345 的前缀，而 234 不是 。
设若整数 c 是整数 a 和 b 的 公共前缀 ，那么 c 需要同时是 a 和 b 的前缀。例如，5655359 和 56554 有公共前缀 565 ，而 1223 和 43456 没有 公共前缀。
你需要找出属于 arr1 的整数 x 和属于 arr2 的整数 y 组成的所有数对 (x, y) 之中最长的公共前缀的长度。
返回所有数对之中最长公共前缀的长度。如果它们之间不存在公共前缀，则返回 0 。
\n\n
示例 1：
\n\n\n输入：arr1 = [1,10,100], arr2 = [1000]\n输出：3\n解释：存在 3 个数对 (arr1[i], arr2[j]) ：\n- (1, 1000) 的最长公共前缀是 1 。\n- (10, 1000) 的最长公共前缀是 10 。\n- (100, 1000) 的最长公共前缀是 100 。\n最长的公共前缀是 100 ，长度为 3 。\n\n\n
示例 2：
\n\n\n输入：arr1 = [1,2,3], arr2 = [4,4,4]\n输出：0\n解释：任何数对 (arr1[i], arr2[j]) 之中都不存在公共前缀，因此返回 0 。\n请注意，同一个数组内元素之间的公共前缀不在考虑范围内。\n\n\n
\n\n
提示：
\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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"sampleTestCase": "[1,10,100]\n[1000]",
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