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题目： The API: int read4(char *buf) reads 4 characters at a time from a file. The return value is the actual number of characters read. For example, it 阅读全文
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题目： Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. pop() -- R 阅读全文
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题目: Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 链接： http://leetcode.com/problems/lin 阅读全文
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题目： Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime com 阅读全文