素履之往

摘要： Problem Definition:Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100".Solution: crack it in a ... 阅读全文

摘要： Problem Definition: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 distin... 阅读全文

摘要： Problem Definition：Given a sorted linked list, delete all duplicates such that each element appear only once. For example,Given 1->1->2, return 1->2.G... 阅读全文