Class Solution
java.lang.Object
g2401_2500.s2454_next_greater_element_iv.Solution
2454 - Next Greater Element IV.<p>Hard</p>
<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>
<p>The <strong>second greater</strong> integer of <code>nums[i]</code> is <code>nums[j]</code> such that:</p>
<ul>
<li><code>j > i</code></li>
<li><code>nums[j] > nums[i]</code></li>
<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>
</ul>
<p>If there is no such <code>nums[j]</code>, the second greater integer is considered to be <code>-1</code>.</p>
<ul>
<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>
</ul>
<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>
<p><strong>Example 1:</strong></p>
<p><strong>Input:</strong> nums = [2,4,0,9,6]</p>
<p><strong>Output:</strong> [9,6,6,-1,-1]</p>
<p><strong>Explanation:</strong></p>
<p>0th index: 4 is the first integer greater than 2, and 9 is the second integer greater than 2, to the right of 2.</p>
<p>1st index: 9 is the first, and 6 is the second integer greater than 4, to the right of 4.</p>
<p>2nd index: 9 is the first, and 6 is the second integer greater than 0, to the right of 0.</p>
<p>3rd index: There is no integer greater than 9 to its right, so the second greater integer is considered to be -1.</p>
<p>4th index: There is no integer greater than 6 to its right, so the second greater integer is considered to be -1.</p>
<p>Thus, we return [9,6,6,-1,-1].</p>
<p><strong>Example 2:</strong></p>
<p><strong>Input:</strong> nums = [3,3]</p>
<p><strong>Output:</strong> [-1,-1]</p>
<p><strong>Explanation:</strong> We return [-1,-1] since neither integer has any integer greater than it.</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 <= nums.length <= 10<sup>5</sup></code></li>
<li><code>0 <= nums[i] <= 10<sup>9</sup></code></li>
</ul>
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Solution
public Solution()
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secondGreaterElement
public int[] secondGreaterElement(int[] nums)
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