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39 lines
2.0 KiB
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<p>A <strong>valid encoding</strong> of an array of <code>words</code> is any reference string <code>s</code> and array of indices <code>indices</code> such that:</p>
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<ul>
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<li><code>words.length == indices.length</code></li>
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<li>The reference string <code>s</code> ends with the <code>'#'</code> character.</li>
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<li>For each index <code>indices[i]</code>, the <strong>substring</strong> of <code>s</code> starting from <code>indices[i]</code> and up to (but not including) the next <code>'#'</code> character is equal to <code>words[i]</code>.</li>
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</ul>
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<p>Given an array of <code>words</code>, return <em>the <strong>length of the shortest reference string</strong> </em><code>s</code><em> possible of any <strong>valid encoding</strong> of </em><code>words</code><em>.</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> words = ["time", "me", "bell"]
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<strong>Output:</strong> 10
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<strong>Explanation:</strong> A valid encoding would be s = <code>"time#bell#" and indices = [0, 2, 5</code>].
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words[0] = "time", the substring of s starting from indices[0] = 0 to the next '#' is underlined in "<u>time</u>#bell#"
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words[1] = "me", the substring of s starting from indices[1] = 2 to the next '#' is underlined in "ti<u>me</u>#bell#"
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words[2] = "bell", the substring of s starting from indices[2] = 5 to the next '#' is underlined in "time#<u>bell</u>#"
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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> words = ["t"]
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> A valid encoding would be s = "t#" and indices = [0].
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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 <= words.length <= 2000</code></li>
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<li><code>1 <= words[i].length <= 7</code></li>
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<li><code>words[i]</code> consists of only lowercase letters.</li>
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</ul>
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