Created
March 7, 2017 21:32
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| def cycle(a): | |
| n = len(a) | |
| idx = 0 | |
| if a[idx] == 0: | |
| return len(a) == 1 | |
| for i in range(n): | |
| idx = (idx + a[idx]) % n | |
| return idx == 0 | |
| assert cycle([0]) == True | |
| assert cycle([0, 0]) == False | |
| assert cycle([0, 1]) == False | |
| assert cycle([1, 0]) == False | |
| assert cycle([1, 1]) == True | |
| assert cycle([1, -1]) == True | |
| assert cycle([2, 2, 2]) == True | |
| assert cycle([2, 2, 1]) == False | |
| assert cycle([1, 2, 0]) == False | |
| assert cycle([2, 2, 0]) == False | |
| assert cycle([2, 2, -1]) == True |
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