mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
29 lines
501 B
Python
29 lines
501 B
Python
|
from __future__ import print_function
|
||
|
|
from math import ceil
|
||
|
|
|
||
|
|
try:
|
||
|
|
xrange #Python 2
|
||
|
|
except NameError:
|
||
|
|
xrange = range #Python 3
|
||
|
|
|
||
|
|
def diagonal_sum(n):
|
||
|
|
total = 1
|
||
|
|
|
||
|
|
for i in xrange(1, int(ceil(n/2.0))):
|
||
|
|
odd = 2*i+1
|
||
|
|
even = 2*i
|
||
|
|
total = total + 4*odd**2 - 6*even
|
||
|
|
|
||
|
|
return total
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
import sys
|
||
|
|
|
||
|
|
if len(sys.argv) == 1:
|
||
|
|
print(diagonal_sum(1001))
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
n = int(sys.argv[1])
|
||
|
|
diagonal_sum(n)
|
||
|
|
except ValueError:
|
||
|
|
print('Invalid entry - please enter a number')
|