摘要：
LottoTime Limit:2 Seconds Memory Limit:65536 KBIn a Lotto I have ever played, one has to select 6 numbers from the set {1,2,...,49}. A popular strategy to play Lotto - although it doesn't increase your chance of winning - is to select a subset S containingk(k>6) of these 49 numbers, and then 阅读全文
