This is the second time I've managed to qualify (barely) out of probably seven attempts. I've never made it past round 1 though.
Maybe this year?...
I don't remember if I was listening to music though...I guess I was in a zone (but I was probably listening to music). As far as music goes though, it is important for me to listen to something that I know well enough that I could sing it while typing something else.
Just to make myself feel bad I went back to the two problems that I solved and did them over. My new solutions are a hundred times cleaner and even solved the hidden tests where my actual submissions failed them.
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