[LeetCode]440. K-th Smallest in Lexicographical Order

https://leetcode.com/problems/k-th-smallest-in-lexicographical-order/#/description java 求字典序的第k个数code 十叉树,好比10 ~ 20在这一层有10个数,若是20小于n,那么再找第三层100 ~ 200,每层step就min(n + 1, n2) - n1ip public class Solution
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