1. LeetCode-1073 负二进制相加 https://leetcode-cn.com/problems/adding-two-negabinary-numbers/
  2. LeetCode-1017 负二进制转换 https://leetcode-cn.com/problems/convert-to-base-2/
  3. LeetCode-406 数字转换为16进制数 https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal/