# Next Greater Element

Posted: 16 Oct, 2020
Difficulty: Moderate

## PROBLEM STATEMENT

#### For Example :

``````If the given array is [1, 3, 2], then you need to return [3, -1, -1]. Because for 1, 3 is the next greater element, for 3 it does not have any greater number to its right, and similarly for 2.
``````
##### Input Format :
``````The first line of input contains a single integer T, representing the number of test cases or queries to be run.

Then the T test cases follow.

The first line of each test case contains an integer N, representing the length of the input array(ARR).

The second line contains N single space-separated integers representing elements of the array arr.
``````
##### Output Format :
``````For each test case, print a list of integers each representing the NGE(next greater element) of each element of the given array in a single line.
``````
##### Note :
``````You are not required to print the expected output, it has already been taken care of. Just implement the function.
``````
##### Constraints :
``````1 <= T <= 10
1 <= N <= 10^5
0 <= ARR[i] <= 10^9

Time Limit: 1sec
``````