for problem E, x=1 directly gives 'ty' and also the parity of 'v'. Tbh I wasnt even thinking to come close to intended solution. Solving other problems seemed kinda boring compared to this. The setters must have felt |cinema|.

Hi, The flag prediction stalls the pipeline as overhead. Moreover, you may read about programming Branchless Instructions. cppcon yt is great to start with.

Thanks for the amazing problems, but I like to point out that the problem F constrained with 1.5 second actually lets through a brute force solution with vectorization. Was this intentional? I was shocked to read the problem and finding it easier than B (the wording could have been simpler for B and C).