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54 lines
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54 lines
3.1 KiB
HTML
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<p>A <strong>triplet</strong> is an array of three integers. You are given a 2D integer array <code>triplets</code>, where <code>triplets[i] = [a<sub>i</sub>, b<sub>i</sub>, c<sub>i</sub>]</code> describes the <code>i<sup>th</sup></code> <strong>triplet</strong>. You are also given an integer array <code>target = [x, y, z]</code> that describes the <strong>triplet</strong> you want to obtain.</p>
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<p>To obtain <code>target</code>, you may apply the following operation on <code>triplets</code> <strong>any number</strong> of times (possibly <strong>zero</strong>):</p>
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<ul>
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<li>Choose two indices (<strong>0-indexed</strong>) <code>i</code> and <code>j</code> (<code>i != j</code>) and <strong>update</strong> <code>triplets[j]</code> to become <code>[max(a<sub>i</sub>, a<sub>j</sub>), max(b<sub>i</sub>, b<sub>j</sub>), max(c<sub>i</sub>, c<sub>j</sub>)]</code>.
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<ul>
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<li>For example, if <code>triplets[i] = [2, 5, 3]</code> and <code>triplets[j] = [1, 7, 5]</code>, <code>triplets[j]</code> will be updated to <code>[max(2, 1), max(5, 7), max(3, 5)] = [2, 7, 5]</code>.</li>
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</ul>
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</li>
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</ul>
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<p>Return <code>true</code> <em>if it is possible to obtain the </em><code>target</code><em> <strong>triplet</strong> </em><code>[x, y, z]</code><em> as an<strong> element</strong> of </em><code>triplets</code><em>, or </em><code>false</code><em> otherwise</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> triplets = [[2,5,3],[1,8,4],[1,7,5]], target = [2,7,5]
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<strong>Output:</strong> true
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<strong>Explanation:</strong> Perform the following operations:
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- Choose the first and last triplets [<u>[2,5,3]</u>,[1,8,4],<u>[1,7,5]</u>]. Update the last triplet to be [max(2,1), max(5,7), max(3,5)] = [2,7,5]. triplets = [[2,5,3],[1,8,4],<u>[2,7,5]</u>]
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The target triplet [2,7,5] is now an element of triplets.
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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> triplets = [[3,4,5],[4,5,6]], target = [3,2,5]
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<strong>Output:</strong> false
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<strong>Explanation:</strong> It is impossible to have [3,2,5] as an element because there is no 2 in any of the triplets.
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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> triplets = [[2,5,3],[2,3,4],[1,2,5],[5,2,3]], target = [5,5,5]
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<strong>Output:</strong> true
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<strong>Explanation: </strong>Perform the following operations:
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- Choose the first and third triplets [<u>[2,5,3]</u>,[2,3,4],<u>[1,2,5]</u>,[5,2,3]]. Update the third triplet to be [max(2,1), max(5,2), max(3,5)] = [2,5,5]. triplets = [[2,5,3],[2,3,4],<u>[2,5,5]</u>,[5,2,3]].
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- Choose the third and fourth triplets [[2,5,3],[2,3,4],<u>[2,5,5]</u>,<u>[5,2,3]</u>]. Update the fourth triplet to be [max(2,5), max(5,2), max(5,3)] = [5,5,5]. triplets = [[2,5,3],[2,3,4],[2,5,5],<u>[5,5,5]</u>].
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The target triplet [5,5,5] is now an element of triplets.
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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 <= triplets.length <= 10<sup>5</sup></code></li>
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<li><code>triplets[i].length == target.length == 3</code></li>
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<li><code>1 <= a<sub>i</sub>, b<sub>i</sub>, c<sub>i</sub>, x, y, z <= 1000</code></li>
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</ul>
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