Columbia University Practice Contest

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Contest of Saturday, October 19, 2019
12:15 to 13:15 EDT

GNYR 2018
Problem A - Potato Sacks
Problem B - Moving Building
Problem C - Hedwig's Ladder
Problem D - Tank and Pipes
Problem E - What Time is it Anyway
Problem F - Left-Right-Win
Problem G - The Erdos-Straus Conjecture
Problem H - Subprime Fibonacci Sequence
Problem I - Airspace Regulation
Problem J - Pinemi Puzzle

For questions, comments, and issues,
please contact your host today at

chengyu at cs period columbia, peilin at columbia period edu

Current date and time:
Tue, 16 Aug 2022 17:54:12 -0400


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