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41 lines
1.8 KiB
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<p>Given a positive integer <code>n</code>, find and return <em>the <strong>longest distance</strong> between any two <strong>adjacent</strong> </em><code>1</code><em>'s in the binary representation of </em><code>n</code><em>. If there are no two adjacent </em><code>1</code><em>'s, return </em><code>0</code><em>.</em></p>
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<p>Two <code>1</code>'s are <strong>adjacent</strong> if there are only <code>0</code>'s separating them (possibly no <code>0</code>'s). The <b>distance</b> between two <code>1</code>'s is the absolute difference between their bit positions. For example, the two <code>1</code>'s in <code>"1001"</code> have a distance of 3.</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> n = 22
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> 22 in binary is "10110".
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The first adjacent pair of 1's is "<u>1</u>0<u>1</u>10" with a distance of 2.
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The second adjacent pair of 1's is "10<u>11</u>0" with a distance of 1.
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The answer is the largest of these two distances, which is 2.
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Note that "<u>1</u>01<u>1</u>0" is not a valid pair since there is a 1 separating the two 1's underlined.
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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> n = 8
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> 8 in binary is "1000".
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There are not any adjacent pairs of 1's in the binary representation of 8, so we return 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> n = 5
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> 5 in binary is "101".
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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 <= n <= 10<sup>9</sup></code></li>
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</ul>
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