Archive 2014 Nov-9th UVa 12849 - Mother's Jam Puzzle 高斯消去 Jul-31st UVa 215 - Spreadsheet Calculator dfs高斯消去 Jul-21st UVa 11542 - Square 高斯消去 Jun-19th UVa 345 - It's Ir-Resist-Able 高斯消去