Using a binary search tree or dividing the string into segments as long as the square root of the length of the string will solve the problem.

 
  • 用一個(gè)二叉搜索樹(shù)或者將串切分成長(cháng)度的平方根那么長(cháng)的小段都可以解決這個(gè)問(wèn)題。
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