摘要：
问题描述： Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 分析： 将k个sorted list合并为一个sorted list借鉴归并排序的方法，自 阅读全文
摘要：
问题描述： Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. F 阅读全文
摘要：
问题描述： Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. 分析： /** * 将一个Integer数字转换为罗马数字，范围 1-3 阅读全文
摘要：
问题描述： Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 算法： /** * 输入一个罗马数字，返回它的整型表示 * @autho 阅读全文
摘要：
问题描述： Given a sorted integer array without duplicates, return the summary of its ranges. For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"]. 阅读全文
摘要：
问题描述： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can 阅读全文
摘要：
问题描述： Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two ele 阅读全文
摘要：
问题描述： Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear run 阅读全文
摘要：
问题描述： Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime c 阅读全文
