leetcode-problemset/leetcode-cn/originData/minimum-number-of-valid-strings-to-form-target-ii.json

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            "questionId": "3557",
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            "categoryTitle": "Algorithms",
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            "title": "Minimum Number of Valid Strings to Form Target II",
            "titleSlug": "minimum-number-of-valid-strings-to-form-target-ii",
            "content": "<p>You are given an array of strings <code>words</code> and a string <code>target</code>.</p>\n\n<p>A string <code>x</code> is called <strong>valid</strong> if <code>x</code> is a <span data-keyword=\"string-prefix\">prefix</span> of <strong>any</strong> string in <code>words</code>.</p>\n\n<p>Return the <strong>minimum</strong> number of <strong>valid</strong> strings that can be <em>concatenated</em> to form <code>target</code>. If it is <strong>not</strong> possible to form <code>target</code>, return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">words = [&quot;abc&quot;,&quot;aaaaa&quot;,&quot;bcdef&quot;], target = &quot;aabcdabc&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The target string can be formed by concatenating:</p>\n\n<ul>\n\t<li>Prefix of length 2 of <code>words[1]</code>, i.e. <code>&quot;aa&quot;</code>.</li>\n\t<li>Prefix of length 3 of <code>words[2]</code>, i.e. <code>&quot;bcd&quot;</code>.</li>\n\t<li>Prefix of length 3 of <code>words[0]</code>, i.e. <code>&quot;abc&quot;</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">words = [&quot;abababab&quot;,&quot;ab&quot;], target = &quot;ababaababa&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The target string can be formed by concatenating:</p>\n\n<ul>\n\t<li>Prefix of length 5 of <code>words[0]</code>, i.e. <code>&quot;ababa&quot;</code>.</li>\n\t<li>Prefix of length 5 of <code>words[0]</code>, i.e. <code>&quot;ababa&quot;</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">words = [&quot;abcdef&quot;], target = &quot;xyz&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-1</span></p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= words[i].length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li>The input is generated such that <code>sum(words[i].length) &lt;= 10<sup>5</sup></code>.</li>\n\t<li><code>words[i]</code> consists only of lowercase English letters.</li>\n\t<li><code>1 &lt;= target.length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li><code>target</code> consists only of lowercase English letters.</li>\n</ul>\n",
            "translatedTitle": "形成目标字符串需要的最少字符串数 II",
            "translatedContent": "<p>给你一个字符串数组 <code>words</code> 和一个字符串 <code>target</code>。</p>\n\n<p>如果字符串 <code>x</code> 是 <code>words</code> 中<strong> 任意 </strong>字符串的 <span data-keyword=\"string-prefix\">前缀</span>，则认为 <code>x</code> 是一个 <strong>有效</strong> 字符串。</p>\n\n<p>现计划通过 <strong>连接 </strong>有效字符串形成 <code>target</code> ，请你计算并返回需要连接的 <strong>最少 </strong>字符串数量。如果无法通过这种方式形成 <code>target</code>，则返回 <code>-1</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">words = [\"abc\",\"aaaaa\",\"bcdef\"], target = \"aabcdabc\"</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>target 字符串可以通过连接以下有效字符串形成：</p>\n\n<ul>\n\t<li><code>words[1]</code> 的长度为 2 的前缀，即 <code>\"aa\"</code>。</li>\n\t<li><code>words[2]</code> 的长度为 3 的前缀，即 <code>\"bcd\"</code>。</li>\n\t<li><code>words[0]</code> 的长度为 3 的前缀，即 <code>\"abc\"</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">words = [\"abababab\",\"ab\"], target = \"ababaababa\"</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>target 字符串可以通过连接以下有效字符串形成：</p>\n\n<ul>\n\t<li><code>words[0]</code> 的长度为 5 的前缀，即 <code>\"ababa\"</code>。</li>\n\t<li><code>words[0]</code> 的长度为 5 的前缀，即 <code>\"ababa\"</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">words = [\"abcdef\"], target = \"xyz\"</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">-1</span></p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= words[i].length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li>输入确保 <code>sum(words[i].length) &lt;= 10<sup>5</sup></code>.</li>\n\t<li><code>words[i]</code> &nbsp;只包含小写英文字母。</li>\n\t<li><code>1 &lt;= target.length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li><code>target</code> &nbsp;只包含小写英文字母。</li>\n</ul>\n",
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                "Let <code>dp[i]</code> be the minimum cost to form the prefix of length <code>i</code> of <code>target</code>.",
                "Use Rabin-Karp to hash every prefix and store it in a HashSet.",
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