5 1 ['0', '0']
6 2 ['0', '0']
9 1 ['0', '0']
10 2 ['0', '0']
13 1 ['0', '0']
14 2 ['0', '0']
17 1 ['0', '0']
18 2 ['0', '0']
python3 altsum_np.py 5 6 9 10 13 14 17 18  0.46s user 0.01s system 99% cpu 0.472 total
