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ProblemsNext Greater Element II

Next Greater Element II

Medium
StacksMonotonic Stack

Given a circular integer array nums (i.e., the next element of nums[nums.length - 1] is nums[0]), return the next greater number for every element in nums.

The next greater number of a number x is the first greater number to its traversing-order next in the array, which means you could search circularly to find its next greater number. If it doesn't exist, return -1.

 

Example 1:

Input: nums = [1,2,1]
Output: [2,-1,2]
Explanation: The next greater number of 1 (index 0) is 2; the number 2 can't find next greater number; the next greater of 1 (index 2) is 2 (searched circularly).

Example 2:

Input: nums = [1,2,3,4,3]
Output: [2,3,4,-1,4]

 

Constraints:

  • 1 <= nums.length <= 104
  • -109 <= nums[i] <= 109

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Input:
nums = [1,2,1]