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题目: Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the tel 阅读全文
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题目： Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integ 阅读全文
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题目： 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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题目： Write a function to find the longest common prefix string amongst an array of strings. 链接：http://leetcode.com/problems/longest-common-prefix/ 题解： 阅读全文
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题目： Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 链接: http://leetcode.com/problems/roman 阅读全文
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题目: Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 链接: http://leetcode.com/problems/integ 阅读全文
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题目： 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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题目: Implement regular expression matching with support for '.' and '*'. 链接：http://leetcode.com/problems/regular-expression-matching/ 题解： 这道题也卡了很久，一开始就 阅读全文
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题目： Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Could negative integers be palindromes? (ie, -1 阅读全文
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题目: Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see be 阅读全文