摘要：
problem description: remove the nth node from the end of the list for example: given: 1->2->3 n = 1 return: 1->2 thought: first:you should know the le 阅读全文
摘要：
problem description: this is the addition about the 3sum,you can use the method of solve the 3sum. given a integer and the target,you should return th 阅读全文