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50 lines
2.3 KiB
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50 lines
2.3 KiB
HTML
<p>You are given a <strong>0-indexed</strong> array of non-negative integers <code>nums</code>. For each integer in <code>nums</code>, you must find its respective <strong>second greater</strong> integer.</p>
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<p>The <strong>second greater</strong> integer of <code>nums[i]</code> is <code>nums[j]</code> such that:</p>
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<ul>
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<li><code>j > i</code></li>
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<li><code>nums[j] > nums[i]</code></li>
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<li>There exists <strong>exactly one</strong> index <code>k</code> such that <code>nums[k] > nums[i]</code> and <code>i < k < j</code>.</li>
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</ul>
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<p>If there is no such <code>nums[j]</code>, the second greater integer is considered to be <code>-1</code>.</p>
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<ul>
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<li>For example, in the array <code>[1, 2, 4, 3]</code>, the second greater integer of <code>1</code> is <code>4</code>, <code>2</code> is <code>3</code>, and that of <code>3</code> and <code>4</code> is <code>-1</code>.</li>
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</ul>
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<p>Return<em> an integer array </em><code>answer</code><em>, where </em><code>answer[i]</code><em> is the second greater integer of </em><code>nums[i]</code><em>.</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 = [2,4,0,9,6]
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<strong>Output:</strong> [9,6,6,-1,-1]
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<strong>Explanation:</strong>
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0th index: 4 is the first integer greater than 2, and 9 is the second integer greater than 2, to the right of 2.
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1st index: 9 is the first, and 6 is the second integer greater than 4, to the right of 4.
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2nd index: 9 is the first, and 6 is the second integer greater than 0, to the right of 0.
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3rd index: There is no integer greater than 9 to its right, so the second greater integer is considered to be -1.
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4th index: There is no integer greater than 6 to its right, so the second greater integer is considered to be -1.
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Thus, we return [9,6,6,-1,-1].
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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 = [3,3]
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<strong>Output:</strong> [-1,-1]
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<strong>Explanation:</strong>
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We return [-1,-1] since neither integer has any integer greater than it.
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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>0 <= nums[i] <= 10<sup>9</sup></code></li>
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</ul>
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