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34 lines
1.5 KiB
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34 lines
1.5 KiB
HTML
<p>You are given a <strong>0-indexed</strong> integer array <code>tasks</code>, where <code>tasks[i]</code> represents the difficulty level of a task. In each round, you can complete either 2 or 3 tasks of the <strong>same difficulty level</strong>.</p>
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<p>Return <em>the <strong>minimum</strong> rounds required to complete all the tasks, or </em><code>-1</code><em> if it is not possible to complete all the tasks.</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> tasks = [2,2,3,3,2,4,4,4,4,4]
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<strong>Output:</strong> 4
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<strong>Explanation:</strong> To complete all the tasks, a possible plan is:
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- In the first round, you complete 3 tasks of difficulty level 2.
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- In the second round, you complete 2 tasks of difficulty level 3.
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- In the third round, you complete 3 tasks of difficulty level 4.
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- In the fourth round, you complete 2 tasks of difficulty level 4.
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It can be shown that all the tasks cannot be completed in fewer than 4 rounds, so the answer is 4.
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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> tasks = [2,3,3]
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<strong>Output:</strong> -1
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<strong>Explanation:</strong> There is only 1 task of difficulty level 2, but in each round, you can only complete either 2 or 3 tasks of the same difficulty level. Hence, you cannot complete all the tasks, and the answer is -1.
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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 <= tasks.length <= 10<sup>5</sup></code></li>
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<li><code>1 <= tasks[i] <= 10<sup>9</sup></code></li>
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</ul>
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