摘要：
Problem Definition:The set [1,2,3,…,n] contains a total of n! unique permutations.By listing and labeling all of the permutations in order,We get the ... 阅读全文
摘要：
Problem Definition:Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the following permutations:[1,2,3], [1,3,... 阅读全文
摘要：
Problem Definition:Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily lar... 阅读全文