XOR Subsequences Discussions | Algorithms | HackerRank
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    Probably because convolutions are usually written with ⊕ just as xor is. More seriously because there is a sliding window which is the main feature of convolutions.

    I do not see yet how to think about the problem with convolutions but hopefully it helps me to find a more elegant solutions that the brute-force Python onliner I came with (with way too many imports).