Print the count of pairs in an array which difference is equal to +4 or -4

Problem to find the pairs in an array which difference is equal to +4 or -4

Example-1:

Input    : n = [ 10, 11, 12, 13, 14, 15, 18]
Output   : (10, 14) (11, 15) (14, 10) (14, 18) (15, 11) (18, 14)

Example-2:

Input    : n = [ 1, 2, 3, 4, 5]
Output   : (1, 5) (5, 1)

Solution

n = [ 10, 11, 12, 13, 14, 15, 18]

n.append([])

for i in range(1,len(n)):

    for j in range(1,len(n)):

        if(i == j):

            continue

        else:

            a = n[i-1]-n[j-1]

            if(a==4 or a==-4):

                print((n[i-1],n[j-1]),end = " ")

Output

(10, 14) (11, 15) (14, 10) (14, 18) (15, 11) (18, 14)