Unofficial Editorial - INVSMOD2

editorial
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Problem Code : INVSMOD2

Hint 1

Page 7, Theorem 3 of https://cs.uwaterloo.ca/journals/JIS/VOL4/MARGOLIUS/inversions.pdf

Hint 2

TonyK comment on binomial coefficients - $C(n,p)$: even or odd? - Mathematics Stack Exchange

Special Hint

If you didn’t get the question even after visiting the above links during contest, here’s an easy Video Editorial.

PS : Stay tuned for more short editorials. :slight_smile:

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Short editorial? Links to a 13 pages article! :roll_eyes:
Anyway, good contribution, I also came up with Knuth’s formula through this paper

Waiting for the official editorial, looking for an alternative approach

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Yeah, it was kind of a stumble upon situation. Also, to make it more accurate, I mentioned the theorem number as well. Would be interesting to know what’s in the official editorial.