k-similar-strings

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Algorithms

Strings <code>s1</code> and <code>s2</code> are <code>k</code>-similar (for some non-negative integer <code>k</code>) if we can swap the positions of two letters in <code>s1</code> exactly <code>k</code> times so that the resulting string equals <code>s2</code>.

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>-similar.

&nbsp;
Example 1:

<pre>
Input: s1 = &quot;ab&quot;, s2 = &quot;ba&quot;
Output: 1
Explanation: The two string are 1-similar because we can use one swap to change s1 to s2: &quot;ab&quot; --&gt; &quot;ba&quot;.
</pre>

Example 2:

<pre>
Input: s1 = &quot;abc&quot;, s2 = &quot;bca&quot;
Output: 2
Explanation: The two strings are 2-similar because we can use two swaps to change s1 to s2: &quot;abc&quot; --&gt; &quot;bac&quot; --&gt; &quot;bca&quot;.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= s1.length &lt;= 20</code></li>
	<li><code>s2.length == s1.length</code></li>
	<li><code>s1</code> and <code>s2</code> contain only lowercase letters from the set <code>{&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;, &#39;e&#39;, &#39;f&#39;}</code>.</li>
	<li><code>s2</code> is an anagram of <code>s1</code>.</li>
</ul>

kSimilarity

K-Similar Strings

Couples Holding Hands

couples-holding-hands

情侣牵手

Breadth-First Search

String

对于某些非负整数 <code>k</code> ，如果交换 <code>s1</code> 中两个字母的位置恰好 <code>k</code> 次，能够使结果字符串等于 <code>s2</code> ，则认为字符串 <code>s1</code> 和 <code>s2</code> 的 相似度为 <code>k</code> 。

给你两个字母异位词 <code>s1</code> 和 <code>s2</code> ，返回 <code>s1</code> 和 <code>s2</code> 的相似度 <code>k</code> 的最小值。

&nbsp;

示例 1：

<pre>
输入：s1 = "ab", s2 = "ba"
输出：1
</pre>

示例 2：

<pre>
输入：s1 = "abc", s2 = "bca"
输出：2
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= s1.length &lt;= 20</code></li>
	<li><code>s2.length == s1.length</code></li>
	<li><code>s1</code>&nbsp;和&nbsp;<code>s2</code>&nbsp;&nbsp;只包含集合&nbsp;<code>{'a', 'b', 'c', 'd', 'e', 'f'}</code>&nbsp;中的小写字母</li>
	<li><code>s2</code> 是 <code>s1</code> 的一个字母异位词</li>
</ul>