problem0859

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Published: Jul 25, 2019 License: MIT Imports: 0 Imported by: 0

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859. Buddy Strings

题目

Given two strings A and Bof lowercase letters, return true if and only if wecan swap two letters in A so that the result equals B.

Example 1:

Input: A = "ab", B = "ba"
Output: true

Example 2:

Input: A = "ab", B = "ab"
Output: false

Example 3:

Input: A = "aa", B = "aa"
Output: true

Example 4:

Input: A = "aaaaaaabc", B = "aaaaaaacb"
Output: true

Example 5:

Input: A = "", B = "aa"
Output: false

Note:

  1. 0 <= A.length <= 20000
  2. 0 <= B.length <= 20000
  3. A andB consist only of lowercase letters.

解题思路

见程序注释

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