{ "data": { "question": { "questionId": "1859", "questionFrontendId": "1737", "categoryTitle": "Algorithms", "boundTopicId": 570585, "title": "Change Minimum Characters to Satisfy One of Three Conditions", "titleSlug": "change-minimum-characters-to-satisfy-one-of-three-conditions", "content": "

You are given two strings a and b that consist of lowercase letters. In one operation, you can change any character in a or b to any lowercase letter.

\n\n

Your goal is to satisfy one of the following three conditions:

\n\n\n\n

Return the minimum number of operations needed to achieve your goal.

\n\n

 

\n

Example 1:

\n\n
\nInput: a = "aba", b = "caa"\nOutput: 2\nExplanation: Consider the best way to make each condition true:\n1) Change b to "ccc" in 2 operations, then every letter in a is less than every letter in b.\n2) Change a to "bbb" and b to "aaa" in 3 operations, then every letter in b is less than every letter in a.\n3) Change a to "aaa" and b to "aaa" in 2 operations, then a and b consist of one distinct letter.\nThe best way was done in 2 operations (either condition 1 or condition 3).\n
\n\n

Example 2:

\n\n
\nInput: a = "dabadd", b = "cda"\nOutput: 3\nExplanation: The best way is to make condition 1 true by changing b to "eee".\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "满足三条件之一需改变的最少字符数", "translatedContent": "

给你两个字符串 a 和 b ，二者均由小写字母组成。一步操作中，你可以将 a 或 b 中的 任一字符 改变为 任一小写字母 。

\n\n

操作的最终目标是满足下列三个条件 之一 ：

\n\n\n\n

返回达成目标所需的 最少 操作数。

\n\n

 

\n\n

示例 1：

\n\n
输入：a = \"aba\", b = \"caa\"\n输出：2\n解释：满足每个条件的最佳方案分别是：\n1) 将 b 变为 \"ccc\"，2 次操作，满足 a 中的每个字母都小于 b 中的每个字母；\n2) 将 a 变为 \"bbb\" 并将 b 变为 \"aaa\"，3 次操作，满足 b 中的每个字母都小于 a 中的每个字母；\n3) 将 a 变为 \"aaa\" 并将 b 变为 \"aaa\"，2 次操作，满足 a 和 b 由同一个字母组成。\n最佳的方案只需要 2 次操作（满足条件 1 或者条件 3）。\n
\n\n

示例 2：

\n\n
输入：a = \"dabadd\", b = \"cda\"\n输出：3\n解释：满足条件 1 的最佳方案是将 b 变为 \"eee\" 。\n
\n\n

 

\n\n

提示：

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