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45 lines
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<p>给你两个单词 <code>word1</code> 和 <code>word2</code>， <em>请返回将 <code>word1</code> 转换成 <code>word2</code> 所使用的最少操作数</em> 。</p>
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<p>你可以对一个单词进行如下三种操作：</p>
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<ul>
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<li>插入一个字符</li>
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<li>删除一个字符</li>
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<li>替换一个字符</li>
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</ul>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>word1 = "horse", word2 = "ros"
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<strong>输出：</strong>3
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<strong>解释：</strong>
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horse -> rorse (将 'h' 替换为 'r')
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rorse -> rose (删除 'r')
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rose -> ros (删除 'e')
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>word1 = "intention", word2 = "execution"
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<strong>输出：</strong>5
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<strong>解释：</strong>
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intention -> inention (删除 't')
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inention -> enention (将 'i' 替换为 'e')
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enention -> exention (将 'n' 替换为 'x')
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exention -> exection (将 'n' 替换为 'c')
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exection -> execution (插入 'u')
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= word1.length, word2.length <= 500</code></li>
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<li><code>word1</code> 和 <code>word2</code> 由小写英文字母组成</li>
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</ul>
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