Changes to contest/acm/UVa/10408

• 2012-11-12 10:48:01 UTC (free999): 新增解法
• 2012-11-10 08:12:34 UTC (float): fix categories
• 2012-11-10 08:11:48 UTC (float): fix categories
• 2012-11-10 07:47:43 UTC (free999): 新增 Uva 10408 題解