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56 lines
2.3 KiB
HTML
56 lines
2.3 KiB
HTML
<p>You are given a <strong>0-indexed</strong> integer array <code>nums</code>.</p>
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<p>Initially, all of the indices are unmarked. You are allowed to make this operation any number of times:</p>
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<ul>
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<li>Pick two <strong>different unmarked</strong> indices <code>i</code> and <code>j</code> such that <code>2 * nums[i] <= nums[j]</code>, then mark <code>i</code> and <code>j</code>.</li>
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</ul>
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<p>Return <em>the maximum possible number of marked indices in <code>nums</code> using the above operation any number of times</em>.</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> nums = [3,5,2,4]
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<strong>Output:</strong> 2
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<strong>Explanation: </strong>In the first operation: pick i = 2 and j = 1, the operation is allowed because 2 * nums[2] <= nums[1]. Then mark index 2 and 1.
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It can be shown that there's no other valid operation so the answer is 2.
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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> nums = [9,2,5,4]
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<strong>Output:</strong> 4
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<strong>Explanation: </strong>In the first operation: pick i = 3 and j = 0, the operation is allowed because 2 * nums[3] <= nums[0]. Then mark index 3 and 0.
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In the second operation: pick i = 1 and j = 2, the operation is allowed because 2 * nums[1] <= nums[2]. Then mark index 1 and 2.
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Since there is no other operation, the answer is 4.
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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> nums = [7,6,8]
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<strong>Output:</strong> 0
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<strong>Explanation: </strong>There is no valid operation to do, so the answer is 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>1 <= nums.length <= 10<sup>5</sup></code></li>
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<li><code>1 <= nums[i] <= 10<sup>9</sup></code></li>
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</ul>
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<p> </p>
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