leetcode-problemset/leetcode-cn/originData/change-minimum-characters-to-satisfy-one-of-three-conditions.json

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            "questionId": "1859",
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            "categoryTitle": "Algorithms",
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            "title": "Change Minimum Characters to Satisfy One of Three Conditions",
            "titleSlug": "change-minimum-characters-to-satisfy-one-of-three-conditions",
            "content": "<p>You are given two strings <code>a</code> and <code>b</code> that consist of lowercase letters. In one operation, you can change any character in <code>a</code> or <code>b</code> to <strong>any lowercase letter</strong>.</p>\n\n<p>Your goal is to satisfy <strong>one</strong> of the following three conditions:</p>\n\n<ul>\n\t<li><strong>Every</strong> letter in <code>a</code> is <strong>strictly less</strong> than <strong>every</strong> letter in <code>b</code> in the alphabet.</li>\n\t<li><strong>Every</strong> letter in <code>b</code> is <strong>strictly less</strong> than <strong>every</strong> letter in <code>a</code> in the alphabet.</li>\n\t<li><strong>Both</strong> <code>a</code> and <code>b</code> consist of <strong>only one</strong> distinct letter.</li>\n</ul>\n\n<p>Return <em>the <strong>minimum</strong> number of operations needed to achieve your goal.</em></p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> a = &quot;aba&quot;, b = &quot;caa&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> Consider the best way to make each condition true:\n1) Change b to &quot;ccc&quot; in 2 operations, then every letter in a is less than every letter in b.\n2) Change a to &quot;bbb&quot; and b to &quot;aaa&quot; in 3 operations, then every letter in b is less than every letter in a.\n3) Change a to &quot;aaa&quot; and b to &quot;aaa&quot; 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</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> a = &quot;dabadd&quot;, b = &quot;cda&quot;\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The best way is to make condition 1 true by changing b to &quot;eee&quot;.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= a.length, b.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>a</code> and <code>b</code> consist only of lowercase letters.</li>\n</ul>\n",
            "translatedTitle": "满足三条件之一需改变的最少字符数",
            "translatedContent": "<p>给你两个字符串 <code>a</code> 和 <code>b</code> ，二者均由小写字母组成。一步操作中，你可以将 <code>a</code> 或 <code>b</code> 中的 <strong>任一字符</strong> 改变为 <strong>任一小写字母</strong> 。</p>\n\n<p>操作的最终目标是满足下列三个条件 <strong>之一</strong> ：</p>\n\n<ul>\n\t<li><code>a</code> 中的 <strong>每个字母</strong> 在字母表中 <strong>严格小于</strong> <code>b</code> 中的 <strong>每个字母</strong> 。</li>\n\t<li><code>b</code> 中的 <strong>每个字母</strong> 在字母表中 <strong>严格小于</strong> <code>a</code> 中的 <strong>每个字母</strong> 。</li>\n\t<li><code>a</code> 和 <code>b</code> <strong>都</strong> 由 <strong>同一个</strong> 字母组成。</li>\n</ul>\n\n<p>返回达成目标所需的 <strong>最少</strong> 操作数<em>。</em></p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>a = \"aba\", b = \"caa\"\n<strong>输出：</strong>2\n<strong>解释：</strong>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</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>a = \"dabadd\", b = \"cda\"\n<strong>输出：</strong>3\n<strong>解释：</strong>满足条件 1 的最佳方案是将 b 变为 \"eee\" 。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= a.length, b.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>a</code> 和 <code>b</code> 只由小写字母组成</li>\n</ul>\n",
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            "hints": [
                "Iterate on each letter in the alphabet, and check the smallest number of operations needed to make it one of the following: the largest letter in a and smaller than the smallest one in b, vice versa, or let a and b consist only of this letter.",
                "For the first 2 conditions, take care that you can only change characters to lowercase letters, so you can't make 'z' the smallest letter in one of the strings or 'a' the largest letter in one of them."
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