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41 lines
1.4 KiB
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41 lines
1.4 KiB
HTML
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<p>给定两个字符串 <code>a</code> 和 <code>b</code>，寻找重复叠加字符串 <code>a</code> 的最小次数，使得字符串 <code>b</code> 成为叠加后的字符串 <code>a</code> 的子串，如果不存在则返回 <code>-1</code>。</p>
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<p><strong>注意：</strong>字符串 <code>"abc"</code> 重复叠加 0 次是 <code>""</code>，重复叠加 1 次是 <code>"abc"</code>，重复叠加 2 次是 <code>"abcabc"</code>。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre><strong>输入：</strong>a = "abcd", b = "cdabcdab"
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<strong>输出：</strong>3
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<strong>解释：</strong>a 重复叠加三遍后为 "ab<strong>cdabcdab</strong>cd", 此时 b 是其子串。
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre><strong>输入：</strong>a = "a", b = "aa"
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<strong>输出：</strong>2
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre><strong>输入：</strong>a = "a", b = "a"
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<strong>输出：</strong>1
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</pre>
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<p><strong>示例 4：</strong></p>
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<pre><strong>输入：</strong>a = "abc", b = "wxyz"
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<strong>输出：</strong>-1
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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>1 <= a.length <= 10<sup>4</sup></code></li>
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<li><code>1 <= b.length <= 10<sup>4</sup></code></li>
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<li><code>a</code> 和 <code>b</code> 由小写英文字母组成</li>
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</ul>
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