Given two strings a and b, return true if you can swap two letters in a so the result is equal to b, otherwise, return false.
Swapping letters is defined as taking two indices i and j (0-indexed) such that i != j and swapping the characters at a[i] and a[j].
- For example, swapping at indices
0and2in"abcd"results in"cbad".
Example 1:
Input: a = "ab", b = "ba" Output: true Explanation: You can swap a[0] = 'a' and a[1] = 'b' to get "ba", which is equal to b.
Example 2:
Input: a = "ab", b = "ab" Output: false Explanation: The only letters you can swap are a[0] = 'a' and a[1] = 'b', which results in "ba" != b.
Example 3:
Input: a = "aa", b = "aa" Output: true Explanation: You can swap a[0] = 'a' and a[1] = 'a' to get "aa", which is equal to b.
Example 4:
Input: a = "aaaaaaabc", b = "aaaaaaacb" Output: true
Constraints:
1 <= a.length, b.length <= 2 * 104aandbconsist of lowercase letters.