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38 lines
1.6 KiB
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<p>A <strong>valid IP address</strong> consists of exactly four integers separated by single dots. Each integer is between <code>0</code> and <code>255</code> (<strong>inclusive</strong>) and cannot have leading zeros.</p>
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<ul>
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<li>For example, <code>"0.1.2.201"</code> and <code>"192.168.1.1"</code> are <strong>valid</strong> IP addresses, but <code>"0.011.255.245"</code>, <code>"192.168.1.312"</code> and <code>"192.168@1.1"</code> are <strong>invalid</strong> IP addresses.</li>
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</ul>
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<p>Given a string <code>s</code> containing only digits, return <em>all possible valid IP addresses that can be formed by inserting dots into </em><code>s</code>. You are <strong>not</strong> allowed to reorder or remove any digits in <code>s</code>. You may return the valid IP addresses in <strong>any</strong> order.</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> s = "25525511135"
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<strong>Output:</strong> ["255.255.11.135","255.255.111.35"]
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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> s = "0000"
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<strong>Output:</strong> ["0.0.0.0"]
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> s = "101023"
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<strong>Output:</strong> ["1.0.10.23","1.0.102.3","10.1.0.23","10.10.2.3","101.0.2.3"]
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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 <= s.length <= 20</code></li>
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<li><code>s</code> consists of digits only.</li>
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</ul>
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