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40 lines
914 B
HTML
40 lines
914 B
HTML
<p>Given a positive integer <code>n</code>, return the number of the integers in the range <code>[0, n]</code> whose binary representations <strong>do not</strong> contain consecutive ones.</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> n = 5
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<strong>Output:</strong> 5
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<strong>Explanation:</strong>
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Here are the non-negative integers <= 5 with their corresponding binary representations:
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0 : 0
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1 : 1
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2 : 10
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3 : 11
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4 : 100
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5 : 101
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Among them, only integer 3 disobeys the rule (two consecutive ones) and the other 5 satisfy the rule.
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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> n = 1
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<strong>Output:</strong> 2
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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> n = 2
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<strong>Output:</strong> 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 <= n <= 10<sup>9</sup></code></li>
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</ul>
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