leetcode

run scripts using command

python -m doctest file.py -v

things to consider

this does not work

>>> A = [2,3,1,0,2,5]
>>> A[0], A[A[0]] = A[A[0]], A[0]  #error
>>> A
[1, 2, 1, 0, 2, 5]
>>> A[0], A[1] = A[1], A[0] #This works