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41 lines
1.2 KiB
HTML
41 lines
1.2 KiB
HTML
<p>There is a broken calculator that has the integer <code>startValue</code> on its display initially. In one operation, you can:</p>
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<ul>
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<li>multiply the number on display by <code>2</code>, or</li>
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<li>subtract <code>1</code> from the number on display.</li>
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</ul>
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<p>Given two integers <code>startValue</code> and <code>target</code>, return <em>the minimum number of operations needed to display </em><code>target</code><em> on the calculator</em>.</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> startValue = 2, target = 3
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> Use double operation and then decrement operation {2 -> 4 -> 3}.
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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> startValue = 5, target = 8
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> Use decrement and then double {5 -> 4 -> 8}.
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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> startValue = 3, target = 10
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> Use double, decrement and double {3 -> 6 -> 5 -> 10}.
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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 <= startValue, target <= 10<sup>9</sup></code></li>
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</ul>
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