摘要：
Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]). F 阅读全文
摘要：
Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the first non-white 阅读全文
摘要：
Given an array w of positive integers, where w[i] describes the weight of index i, write a function pickIndex which randomly picks an index in proport 阅读全文
摘要：
Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2. Note: The length of both num1 and num2 is < 5100 阅读全文
摘要：
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 retu 阅读全文
摘要：
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 retu 阅读全文