摘要： Party Lamps IOI 98To brighten up the gala dinner of the IOI'98 we have a set of N (10 <= N <= 100) colored lamps numbered from 1 to N.The lamps are connected to four buttons:Button 1: When this button is pressed, all the lamps change their state: those that are ON are turned OFF and those 阅读全文

摘要： Runaround NumbersRunaround numbers are integers with unique digits, none of which is zero (e.g., 81362) that also have an interesting property, exemplified by this demonstration:If you start at the left digit (8 in our number) and count that number of digits to the right (wrapping back to the first 阅读全文

摘要： 分类：DP，递推，记忆化搜索作者：ACShiryu时间：2011-7-15Subset Sums JRMFor many sets of consecutive integers from 1 through N (1 <= N <= 39), one can partition the set into two sets whose sums are identical.For example, if N=3, one can partition the set {1, 2, 3} in one way so that the sums of both subsets are i 阅读全文