摘要：Problem Statement Definition Limits Constraints Examples 题意：从１到１００挑出Ｋ个数字，挑出的数字可正可负，求一种总和不为Ｎ的方案． 分析：如果Ｎ为奇数，那么选前Ｋ个最小的偶数一定不会组成奇数．类似的，如果Ｎ不是３的倍数，那么选择前Ｋ个最小的 阅读全文

摘要：Problem Statement You are a genealogist specializing in family trees of vampires. Vampire family trees differ from human family trees. In particular, 阅读全文

摘要：Problem Statement Cat Noku has just finished writing his first computer program. Noku's computer has m memory cells. The cells have addresses 0 throug 阅读全文