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45 lines
1.3 KiB
HTML
45 lines
1.3 KiB
HTML
<p>Given an integer <code>num</code>, return <em>the number of steps to reduce it to zero</em>.</p>
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<p>In one step, if the current number is even, you have to divide it by <code>2</code>, otherwise, you have to subtract <code>1</code> from it.</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> num = 14
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<strong>Output:</strong> 6
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<strong>Explanation:</strong>
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Step 1) 14 is even; divide by 2 and obtain 7.
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Step 2) 7 is odd; subtract 1 and obtain 6.
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Step 3) 6 is even; divide by 2 and obtain 3.
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Step 4) 3 is odd; subtract 1 and obtain 2.
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Step 5) 2 is even; divide by 2 and obtain 1.
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Step 6) 1 is odd; subtract 1 and obtain 0.
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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> num = 8
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<strong>Output:</strong> 4
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<strong>Explanation:</strong>
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Step 1) 8 is even; divide by 2 and obtain 4.
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Step 2) 4 is even; divide by 2 and obtain 2.
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Step 3) 2 is even; divide by 2 and obtain 1.
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Step 4) 1 is odd; subtract 1 and obtain 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> num = 123
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<strong>Output:</strong> 12
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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>0 <= num <= 10<sup>6</sup></code></li>
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</ul>
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