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题目: 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 yo 阅读全文
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题目: Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100". 链接: http://leetcode.com/problems/add-b 阅读全文
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题目: Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit 阅读全文