SUMSUMS PROBLEM

#1

I did not get how ouptut is 26 25 and 29 for a given input explaint it a little

#2

The array changes as follows

1 0 4 -> Initial
4 5 1 -> after 1st step
6 5 9 -> after 2nd step
14 15 11 -> after 3rd step
26 25 29 -> after 4th step

#3

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