Python/data_structures/stacks/next_greater_element.py

# Function to print element and NGE pair for all elements of list
def printNGE(arr):

    for i in range(0, len(arr), 1):

        next = -1
        for j in range(i+1, len(arr), 1):
            if arr[i] < arr[j]:
                next = arr[j]
                break

        print(str(arr[i]) + " -- " + str(next))

# Driver program to test above function
arr = [11,13,21,3]
printNGE(arr)