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题目 题目来源：Link 给定一个字符串所表示的括号序列，包含以下字符： '(', ')', '{', '}', '[' and ']'， 判定是否是有效的括号序列。 您在真实的面试中是否遇到过这个题？  Yes 样例 括号必须依照 "()" 顺序表示， "()[]{}" 是有效的括号，但 "([)]"则是无效的括

题目 题目来源：Link Given two non-negative integers num1 and num2represented as string, return the sum of num1 and num2.  注意事项 The length of both num1 and num2 is Both num1 and nu

题目 题目来源：Link We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I'll tell you wh

http://www.lintcode.com/zh-cn/problem/first-position-of-target/ http://www.jiuzhang.com/article/Google%202016%E5%B9%B412%E6%9C%88New%20Grad%20SDE%E7%94%B5%E9%9D%A2%E9%9D%A2%E7%BB%8F/

http://www.jiuzhang.com/article/Google2015New%20Grad%20%E8%BD%AF%E4%BB%B6%E5%B7%A5%E7%A8%8B%E5%B8%88onsite/ http://www.lintcode.com/zh-cn/problem/matrix-zigzag-traversal/ 给你一个包含 m x n 个元素的