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edited Dec 21, 2021 at 15:17

Python, 5757, 54 bytes (@GB)

lambda a,y,x,i=0:sum((r*(i:=i+x))[i-x]for r in a[::y])

lambda a,y,x,i=0:sum(r[(i:=i%len(r)+x)-x]for r in a[::y])

Expects a list of lists of 0s and 1s plus two integers.

lambda a,y,x,i=0:sum(r[(i:=i%len(r)+x)-x]for r in a[::y])

Expects a list of lists of 0s and 1s plus two integers.

lambda a,y,x,i=0:sum((r*(i:=i+x))[i-x]for r in a[::y])

lambda a,y,x,i=0:sum(r[(i:=i%len(r)+x)-x]for r in a[::y])

Expects a list of lists of 0s and 1s plus two integers.

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created Dec 21, 2021 at 0:47

lambda a,y,x,i=0:sum(r[(i:=i%len(r)+x)-x]for r in a[::y])

Expects a list of lists of 0s and 1s plus two integers.