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  1. def f(a):
  2. 	e=enumerate;print sum(i*(x+y==i)for x,r in e(a)for y,i in e(r))
  3.  
  4. f([])
  5. f([[2]])
  6. f([[1,5,2],[9,4,2],[5,9,6]])
  7. f([[0,3,0,4],[0,4,1,4],[4,3,1,2],[-2,4,-2,-1]])
  8. f([[3,-1,3,3],[3,-1,3,1]])
Success #stdin #stdout 0.01s 9016KB
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https://ideone.com/MHo5jx
language:
Python (cpython 2.7.16)
created:
7 years ago
visibility:
public

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