如何生成随机数，同时避免使用已使用的数字 [英] How do generate random numbers, while avoiding numbers already used

问题描述

我如何生成随机数，但要避免使用已经使用过的数字.我有一个包含成千上万个数字的TXT文件，我需要在避免这些数字的同时生成一系列随机数.

How do i generate random numbers but have the numbers avoid numbers already used. I have a TXT file with thousands of sets of numbers and i need to generate a series of random numbers while avoiding these.

IE，TXT-0102030405
我的随机数需要避免使用此数字.

IE, TXT - 0102030405
my random number needs to avoid this number.

在旁注中，如何将TXT 10位数字分成5位和两位数字?那么我如何基于此生成随机数.

on a side note, how can i split up the TXT 10 digit number into 5, two digit numbers? then how can i generate random numbers based off of that.

推荐答案

如果您需要维护文件(我想这样做，以便添加新数字)，建议您使用纯文本忘记"文本文件，并使用SQLite或文件中备份的任何其他嵌入式DB，因为您可能不想将所有数字加载到内存中.

If you need to maintain the file (which I think you do, in order to add new numbers), I would suggest you to "forget" using a plain text file and use SQLite or any other embedded DB that is backed up in a file, as you probably don't want to load all the numbers in memory.

SQLite想要的功能"(或更确切地说，数据结构)是B树，因此您可以快速检索数字.我说这是因为，您还可以尝试找到实现B树的库，这样就不需要SQLite.

The "feature" (or better said, data structure) you want from SQLite is a B-Tree, so you can retrieve the numbers fast. I'm saying this, because you could also try to find a library that implements B-Trees, and then you wouldn't need SQLite.

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