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easy
Stack

Next Greater Element

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Next Greater Element** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Monotonic decreasing stack left-to-right **Edge Cases to Consider:** - (1) Strictly decreasing (no next greater) - (2) Strictly increasing - (3) Single element

Examples

Example 1
Input: [4,1,2], [1,3,4,2]
Output: [-1,3,-1]
Explanation: Classic
Example 2
Input: [2,4], [1,2,3,4]
Output: [3,-1]
Example 3
Input: [1], [1]
Output: [-1]
Explanation: No greater

Constraints

  • ▪Input arguments are within valid ranges
  • ▪Optimize for execution speed
  • ▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

  • ▪Strictly decreasing (no next greater)
  • ▪Strictly increasing
  • ▪Single element
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