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Is 427C solvable by using Kosaraju's algo and color the vertices belonging to same SCC wit h some color? Or is there a better way to solve this? Please post a link also to your submissions. Thanks :)

I too have the same doubt! If you had cleared it pls share with us!

On SerejaCodeforces Round #243, 12 years ago
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Can you provide the link to a properly implemented solution? Thanks in advance!

Thanks a lot :D BTW you made a typo there X[r]^X[n] should be X[r]^X[k-1]. Really awesome explanation thanks!! :D

Can someone explain the logic behind 424C — Magic formulas?