Neil的博客

Problem description:Please list all of the subsets of a known set including the empty set.Thinking: the subset's sum of a super set is (n is the number of the super set element) while a n-bit bina

Problem description:Calculate the prime numbers with a sieve method.There is a magical sieve that can remove all the multiple of the number i.Please calculate the prime numbers at a range from 2 to N

Problem description:Please list all of the subsets of a known set including the empty set.My idea: one thinking of the algorithm backtracking is to generate a tree of subset and the condition of a

Problem description:When we calculate for prime numbers with a sieve method,we delete so many numbers which is not necessary repeatly.For instance,there is a number which consists of 3x7x17x23,and we