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题意： Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum 阅读全文
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题意： Implement regular expression matching with support for '.' and '*'. 阅读全文
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题意： Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in 阅读全文
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题意： Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. （Eas 阅读全文
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题意： Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 分析： 开始准备采用将罗马数字的字符串先划分千位，百位等，但是实际操作起来代 阅读全文
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题意： Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 分析： 题目其实不难，但是需要先了解罗马数字的组成规则。 摘录百度百科如下： 阅读全文
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题意： Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two e 阅读全文
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题意： Given a linked list, remove the nth node from the end of list and return its head. For example, 分析：题目虽然是easy，但是用one pass做起来还是包含几个链表常用的手法的，有参考价值； 链 阅读全文
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题意： Write a function to find the longest common prefix string amongst an array of strings. (Easy) 这两天实验室项目太忙了， 老板各种活，只能挑着先水几道easy题，这两个题是昨天做的没来得及写总结。 分 阅读全文
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题意： Determine whether an integer is a palindrome. Do this without extra space. (Easy) 分析： 自己考虑的方法是利用Reverse Integer，然后查看rev与x是否相等，注意负数和0的判断(这里WA了一次) 代 阅读全文