00:00 - Problem A: Avoiding Zero
02:15 - Problem B: Chess Cheater
11:12 - Problem C: The Hard Work of Paparazzi
19:44 - Problem D: Unshuffling a Deck
26:28 - Problem E: Xum (Must Watch!)
I forgot to say it in the video but Problem E was very very interesting and I recommend everyone to watch it.
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