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Given a 32-bit signed integer, reverse digits of an integer. Example 1: Example 2: Example 3: Note:Assume we are dealing with an environment which cou 阅读全文
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Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex 阅读全文
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Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. Example 1: Example 2: 阅读全文
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Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index. According 阅读全文
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Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Example: Note: 1. 1 is typic 阅读全文
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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 elements 阅读全文
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Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek() operation -- it e 阅读全文
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Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. Th 阅读全文
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记录自己在linux上搭建go环境的经历。（因为各种版本，linux系统问题挣扎了几天） 内核版本发行版本命令：cat /etc/issue Ubuntu位数：sudo uname --m 我开始使用的32位Ubuntu，所以go也下载的这个版本，结果bug了。 go代码里面使用Add64数据结构程 阅读全文
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Berkerly DB 是一种嵌入式数据库。 1.数据类型 数据库句柄结构 DB，相当于表，存储key/value对。 数据库记录结构 DBT，表示关键字、数据，即key/value。其中两个重要字段：数据值void *data,数据大小u_int32_t size 数据库游标结构 DBC，可作为遍 阅读全文