Leetcode 3137. Minimum Number of Operations to Make Word K-Periodic

  • [Leetcode 3137. Minimum Number of Operations to Make Word K-Periodic](#Leetcode 3137. Minimum Number of Operations to Make Word K-Periodic)
    • [1. 解题思路](#1. 解题思路)
    • [2. 代码实现](#2. 代码实现)

1. 解题思路

这一题的话我们只需要将原始的字符串按照k个字母为一组进行分组,然后看各自出现的频次即可,取出最大频次的subarray作为最终的目标,即可快速得到答案为总的group数减去最大单一频次。

2. 代码实现

给出python代码实现如下:

python 复制代码
class Solution:
    def minimumOperationsToMakeKPeriodic(self, word: str, k: int) -> int:
        cnt = defaultdict(int)
        n = len(word)
        for i in range(0, n, k):
            cnt[word[i:i+k]] += 1
        return n // k - max(cnt.values())

提交代码评测得到:耗时101ms,占用内存18.9MB。

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