Lmao why are you comparing my beloved lichess to the dumpster fire that is codechef I literally joined a round and then they removed a problem halfway through the round because author solution was wrong and 20 minutes from the end they added a new problem and extended the round duration. ...
And about my "old" nickname (still used at a lot of sites — TopCoder, Codechef etc.), as gkeesh7 correctly pointed out, it is related to LeBron James. It is ~10 years old :) At that moment I was a small boy and a fan of basketball, and I don't even remember clearly when...
N-1 N-2 N-3 ... etc The main observation being that the smallest multiple of x that isn't x is 2x. Trivial observations are easy to miss and I didn't think of that until finding the construction. The second seems to be a mix of greedy thinking (use big numbers to escape the s...
Another advantage is that usually in a 3 to 3.5 hour contest one gets a way to cheat on stack overflow or stack exchange because one may usually get good replies there within 1 hour(I have seen a lot of that on codechef cook off) . The website runs awesome . Its very smooth during...