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37 lines
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37 lines
1.3 KiB
HTML
<p>You are given a string <code>num</code>, representing a large integer. Return <em>the <strong>largest-valued odd</strong> integer (as a string) that is a <strong>non-empty substring</strong> of </em><code>num</code><em>, or an empty string </em><code>""</code><em> if no odd integer exists</em>.</p>
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<p>A <strong>substring</strong> is a contiguous sequence of characters within a string.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> num = "52"
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<strong>Output:</strong> "5"
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<strong>Explanation:</strong> The only non-empty substrings are "5", "2", and "52". "5" is the only odd number.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> num = "4206"
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<strong>Output:</strong> ""
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<strong>Explanation:</strong> There are no odd numbers in "4206".
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> num = "35427"
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<strong>Output:</strong> "35427"
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<strong>Explanation:</strong> "35427" is already an odd number.
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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 <= num.length <= 10<sup>5</sup></code></li>
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<li><code>num</code> only consists of digits and does not contain any leading zeros.</li>
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</ul>
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