#155 · #3043 · Find the Length of the Longest Common Prefix(最长公共前缀的长度)

You are given two arrays of positive integers arr1 and arr2. For each pair of integers, consider their decimal string representations. Return the length of the longest common prefix among all such pairs. Constraints: 1 <= arr1.length, arr2.length <= 5 * 10^4, 1 <= arr1[i], arr2[i] <= 10^8.