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<p>Given two anagrams <code>s1</code> and <code>s2</code>, return the smallest <code>k</code> for which <code>s1</code> and <code>s2</code> are <code>k</code><strong>-similar</strong>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></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> s1 = "ab", s2 = "ba"
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> The two string are 1-similar because we can use one swap to change s1 to s2: "ab" --> "ba".
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</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s1 = "abc", s2 = "bca"
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> The two strings are 2-similar because we can use two swaps to change s1 to s2: "abc" --> "bac" --> "bca".
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</pre>
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<p> </p>
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