Answer to Question #224851 in Python for hari

Question

Trapezium Order
you are given an integer N . print N rows starting from 1 in the trapexium order as shown in the output of the below examples .
Input
the input contains an integer N
OUTPUT
the output should have N lines
each of the N lines should have space -seperated integers as per the trapezium order
SAMPLE INPUT 1
4
SAMPLE OUTPUT 1
1 2 3 4 17 18 19 20
5 6 7 14 15 16
8 9 12 13
10 11

Answer 1

n = int(input())
mx = n*(n+1)
lst = [i+1 for i in range(mx)]
start = 0
stop = len(lst)
for i in range(n,0,-1):
	print(*(lst[start:start+i] + lst[stop-i:stop]))
	start += i
	stop -= i