摘要：
1.题目描述 Given a sorted linked list, delete all duplicates such that each element appear only once. 给出一个链表，删除重复元素，确保每个元素只出现一次 2.题目分析 链表中的数字按一定顺序排好，所以只需要 阅读全文
摘要：
1.题目描述 You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can 阅读全文