摘要：
题目链接Given a stringsconsists of upper/lower-case alphabets and empty space characters' ', return the length of last word in the string.If the last word... 阅读全文
摘要：
题目链接The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence... 阅读全文