Added Next Greater Element problem in Java under stack#187
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admirerr merged 1 commit intoadmirerr:mainfrom Oct 10, 2025
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Input:
Array size: 5
Elements: 4 5 2 25 7
Output:
4 -> 5
5 -> 25
2 -> 25
25 -> -1
7 -> -1
How it works (step by step)
Use a stack to keep track of elements we’ve seen so far.
Traverse the array from right to left:
For each element, remove (pop) all elements in the stack smaller or equal to it.
If the stack is empty → no greater element → put -1.
If the stack is not empty → top of stack is the next greater element.
Push the current element to the stack.