Although I didn't make it to Round 3, I've been trying to solve the problems 
with the practice data. And I just don't understand the results for River Flow. 
The third case in the small input is this:

21 2
5 0 1 0 5 0 1 0 5 0 1 0 5 0 1 0 5 0 1 0 5

The expected result here is that the farmers are cheating. But it seems to me 
that this case can legitimately be produced by 7 farmers:

2 farmers start diverting on day 2, and toggle every second day
2 farmers start diverting on day 3, and toggle every second day
3 farmers start diverting on day 2, and toggle every day.

Can anyone explain what I am missing?

[Note: if the farmers were adding water instead of removing it, then this and 
all the other results on the practice data would make sense to me.]

[Credit: I used wangyisong1996's code to figure out where my results differed 
from the expected ones.]

Thanks in advance!

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