摘要：实现atoi这个函数，public int atoi(String str)，传入字符串str可以返回整数，请仔细考虑一下字符串的各种情况!String to Integer: Case分析正常数字Sample:”123”,”0”,”1” ,"-1"普通特殊字符:Sample: "000","001... 阅读全文

摘要：Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321Discuss: 1.If the integer's last digit is 0, what should the ... 阅读全文

摘要：1Two Sum25arraysortsetTwo Pointers2Add Two Numbers34linked listTwo PointersMath3Longest Substring Without Repeating Characters32stringTwo Pointershash... 阅读全文