Problem Statement
Find next greater element for each array element.
Approach
Monotonic decreasing stack. Pop smaller elements, assign their NGE.
Time & Space Complexity
Time O(n), Space O(n).

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Monotonic stack for next greater element.
Find next greater element for each array element.
Monotonic decreasing stack. Pop smaller elements, assign their NGE.
Time O(n), Space O(n).
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