Archive 2015 05/11 UVa 10799 - OOPS! They did it Again... 數學觀察 2014 12/27 UVa 1482 - Playing With Stones SG博弈觀察 12/14 UVa 12866 - Combination 數學觀察遞推 11/22 UVa 12865 - Volume Control 數學窮舉觀察 05/19 UVa 12716 - GCD XOR 觀察