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36 lines
1.7 KiB
HTML
36 lines
1.7 KiB
HTML
<p>You are given two <strong>0-indexed</strong> integer arrays <code>fronts</code> and <code>backs</code> of length <code>n</code>, where the <code>i<sup>th</sup></code> card has the positive integer <code>fronts[i]</code> printed on the front and <code>backs[i]</code> printed on the back. Initially, each card is placed on a table such that the front number is facing up and the other is facing down. You may flip over any number of cards (possibly zero).</p>
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<p>After flipping the cards, an integer is considered <strong>good</strong> if it is facing down on some card and <strong>not</strong> facing up on any card.</p>
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<p>Return <em>the minimum possible good integer after flipping the cards</em>. If there are no good integers, return <code>0</code>.</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> fronts = [1,2,4,4,7], backs = [1,3,4,1,3]
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<strong>Output:</strong> 2
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<strong>Explanation:</strong>
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If we flip the second card, the face up numbers are [1,3,4,4,7] and the face down are [1,2,4,1,3].
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2 is the minimum good integer as it appears facing down but not facing up.
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It can be shown that 2 is the minimum possible good integer obtainable after flipping some cards.
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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> fronts = [1], backs = [1]
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<strong>Output:</strong> 0
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<strong>Explanation:</strong>
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There are no good integers no matter how we flip the cards, so we return 0.
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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>n == fronts.length == backs.length</code></li>
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<li><code>1 <= n <= 1000</code></li>
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<li><code>1 <= fronts[i], backs[i] <= 2000</code></li>
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</ul>
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