HackerRank Implementation - 华繁的博客



HackerRank Implementation - 华繁的博客

字符串处理。要求输出下一个比给定字符串大的串,字母不能改变,并且是字母序最小的那个。

O(n)就可以做。思路:

  1. 从字符串最后一位开始往前扫描,找到第一个不按字母序排列的字符,即不满足w[i]<=w[i-1]
  2. 再从后往前扫描一遍,找到第一个比1找到的字符小的字符,交换两个位置
  3. 再将步骤1中位置之后的部分翻转


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