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41 lines
2.0 KiB
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<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>
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<p>Your goal is to satisfy <strong>one</strong> of the following three conditions:</p>
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<ul>
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<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>
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<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>
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<li><strong>Both</strong> <code>a</code> and <code>b</code> consist of <strong>only one</strong> distinct letter.</li>
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</ul>
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<p>Return <em>the <strong>minimum</strong> number of operations needed to achieve your goal.</em></p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> a = "aba", b = "caa"
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> Consider the best way to make each condition true:
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1) Change b to "ccc" in 2 operations, then every letter in a is less than every letter in b.
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2) Change a to "bbb" and b to "aaa" in 3 operations, then every letter in b is less than every letter in a.
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3) Change a to "aaa" and b to "aaa" in 2 operations, then a and b consist of one distinct letter.
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The best way was done in 2 operations (either condition 1 or condition 3).
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> a = "dabadd", b = "cda"
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> The best way is to make condition 1 true by changing b to "eee".
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= a.length, b.length <= 10<sup>5</sup></code></li>
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<li><code>a</code> and <code>b</code> consist only of lowercase letters.</li>
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</ul>
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