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花花酱 LeetCode 1897. Redistribute Characters to Make All Strings Equal

You are given an array of strings words (0-indexed).

In one operation, pick two distinct indices i and j, where words[i] is a non-empty string, and move any character from words[i] to any position in words[j].

Return true if you can make every string in words equal using any number of operations, and false otherwise.

Example 1:

Input: words = ["abc","aabc","bc"]
Output: true
Explanation: Move the first 'a' in words[1] to the front of words[2],
to make words[1] = "abc" and words[2] = "abc".
All the strings are now equal to "abc", so return true.

Example 2:

Input: words = ["ab","a"]
Output: false
Explanation: It is impossible to make all the strings equal using the operation.


  • 1 <= words.length <= 100
  • 1 <= words[i].length <= 100
  • words[i] consists of lowercase English letters.

Solution: Hashtable

Count the frequency of each character, it must be a multiplier of n such that we can evenly distribute it to all the words.
e.g. n = 3, a = 9, b = 6, c = 3, each word will be “aaabbc”.

Time complexity: O(n)
Space complexity: O(1)


Python3 one-liner

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