Next Greater Element Problem Statement

You are given an array arr of length N. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater element, return -1.

Input:

T N arr[0] arr[1] ... arr[N-1]

Output:

NGE[0] NGE[1] ... NGE[N-1]

Example:

Input:

1
3
1 3 2

Output:

3 -1 -1

Explanation:

For 1, 3 is the next greater element. 3 has no greater element to its right, so it returns -1. Similarly, 2 also returns -1.

Constraints:

1

Question

Next Greater Element Problem Statement

You are given an array arr of length N. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater element, return -1.

Input:

T 
 N 
 arr[0] arr[1] ... arr[N-1]

Output:

NGE[0] NGE[1] ... NGE[N-1]

Example:

Input:

1 
 3 
 1 3 2

Output:

3 -1 -1

Explanation:

For 1, 3 is the next greater element. 3 has no greater element to its right, so it returns -1. Similarly, 2 also returns -1.

Constraints:

1 <= T <= 10
1 <= N <= 10^5
0 <= arr[i] <= 10^9
Time Limit: 1 sec

Note:

Implement the function without printing anything; printing is already handled.

Accepted Answer

The task is to find the next greater element for each element in the given array.

Iterate through the array from right to left.
Use a stack to keep track of the next greater element.
Pop elements from the stack until a greater element is found or the stack is empty.
If the stack is empty, there is no greater element, so assign -1.
If a greater element is found, assign it as the next greater element.
Push the current element onto the stack.
Return the list of next greater elements.

Accepted Answer

t= int(input())
for _ in range(t):
    arr = list(map(int,input().split()))
    n = len(arr)
    res = []
    curr = arr[0]
    for i in range(1,n):
        temp = -1
        if (curr

Next Greater Element Problem Statement

Input:

Output:

Example:

Input:

Output:

Explanation:

Constraints:

Note:

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