Data-Structures-and-Algorithms/DATA STRUCTURES/Array/Next Greater Element at master · shoaibrayeen/Data-Structures-and-Algorithms · GitHub

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readMe.md

Given an array, print the Next Greater Element (NGE) for every element. The Next greater Element for an element x is the first greater element on the right side of x in array. Elements for which no greater element exist, consider next greater element as -1.

For any array, rightmost element always has next greater element as -1.
For an array which is sorted in decreasing order, all elements have next greater element as -1.
For the input array [4, 5, 2, 25}, the next greater elements for each element are as follows.

Element       NGE
   4      -->   5
   5      -->   25
   2      -->   25
   25     -->   -1

For the input array [13, 7, 6, 12}, the next greater elements for each element are as follows.

  Element        NGE
   13      -->    -1
   7       -->     12
   6       -->     12
   12     -->     -1