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MainBoard >> 2018西电程序设计竞赛答疑

adminlight @ 2018-04-10 13:05:38

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Ask Me Anything!

INnoVation @ 2018-04-11 21:31:01

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求教1085诺爷与粉丝的做法，我用了矩阵快速幂依然超时。

adminlight @ 2018-04-12 11:12:38

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@INnoVation I think this is off-topic in this thread.

No response, read statement carefully.

17131212946 @ 2018-04-12 11:29:22

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Are the problems sorted by difficulty?

1111 @ 2018-04-12 14:22:41

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多组数据,每行两个正整数 a,b, 0 < a, b ≤ 10000000,处理到 EOF 结束；
处理到EOF结束是什么意思？

chier @ 2018-04-12 17:42:35

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H题变化率指的光是减的还是包含增的？

adminlight @ 2018-04-12 22:03:37

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@17131212946 No.

@1111 No response, please read FAQ.

@chier No response, read statement carefully.

15020130033 @ 2018-04-13 14:46:51

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E题初始状态是1个小杰1个小国，使用第一种魔法，结果是0个小杰，2个小国吗？若小杰0个，小国2个，使用第二种魔法，是小杰2个小国4个吧？

adminlight @ 2018-04-13 15:13:07

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No. Little Guo is _"copied into"_ in magic 1, not "converted to".

15070110001 @ 2018-04-13 16:09:54

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E题是恰得到n个小国，还是大于n个就行

15010120028 @ 2018-04-13 16:41:19

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E题理解有疑问：使用第一种魔法，小国个数在原基础上，增加小杰的个数；使用第二种魔法，小杰个数等于小国个数，小国个数加倍。是这样吗？

adminlight @ 2018-04-13 17:01:57

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@15070110001: EXACTLY n Little Guos.

@15010120028: Yes.

16140110069 @ 2018-04-13 18:36:44

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网络赛报名时不小心填错了学院提交了，怎么办？

adminlight @ 2018-04-13 19:52:06

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@16140110069 姓名学号正确即可。

liubo @ 2018-04-13 20:34:04

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为甚么总是提交不了点击提交没有反应

adminlight @ 2018-04-13 20:57:21

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@liubo: Do not use 360 browser. Use Chrome or Firefox insteadly.

adminlight @ 2018-04-14 11:56:38

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@15020520034: No response, read statement carefully.

And according to the contest rule you should NOT ask others to help debugging your program. I issue a warning here.

adminlight @ 2018-04-14 12:05:23

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Rational of "Runtime Error":

In C/C++ a "Runtime Error" means one of the following:
1. a non-zero return value (you forgot to "return 0;");
2. an UNIX signal (most likely SIGSEGV or SIGFPE);
3. a restricted system call.

In Java a "Runtime Error" means an object of class java.lang.Exception (or its derived class) has been throwed.

liubo @ 2018-04-14 19:37:33

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第一题的A<>B是什么意思

adminlight @ 2018-04-14 19:39:22

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@liubo: "<>" is a syntax in an ancient (and deprecated) language called Pascal. It should be "!=" in C/C++/Java/Python, and "\neq" in LaTeX.

adminlight @ 2018-04-14 19:47:35

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If there are any strange syntaxs in problem description, please refer to the PDF version:
<http://acm.xidian.edu.cn/download/2018-online.pdf>

limingxuan @ 2018-04-16 19:14:29

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无论什么程序都是超时，不管是时间复杂度是多少，甚至是输入一个错误的程序也只会输出时间超时，该怎么办

maisui @ 2018-04-16 20:19:30

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编译错误是怎么回事呀？为啥在本地上代码编译运行通过，在系统上就显示编译错误呢？

adminlight @ 2018-04-17 10:45:27

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@limingxuan: Of course "Time Limit Exceeded" is prior to "Wrong Answer". We can't wait a slow program to finish and test its answer, or our server will hang forever.

@maisui: You can click on "Compile Error" yellow button to see the error message. And I can't find any of your submittion with "Compile Error" verdict.

adminlight @ 2018-04-17 11:07:58

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About Compile Errors:

1. I told you do NOT include CJK characters in your program, for ten times!

2. What the f**k is stdafx.h? It can contain anything. What should we do? Guess?

3. Who told you C/C++ can support Variable Length Arrays?

4. Who told you C has <iostream.h>?

5. What the f**k is scanf_s? Which standard defined it?

CynthiaDing @ 2018-04-17 17:19:54

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我把ID填错了怎么办？再次进入报名页面，提示报名成功！我的ID还用改吗？

maisui @ 2018-04-17 17:21:43

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b题是运行错误，但是我在本地是已经显示出结果了，不知道是什么原因。我的编译环境是vc++6.0和dev c++.两者都能出来结果！

maisui @ 2018-04-17 18:14:29

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咱们这个系统检测多久出结果呀，已经等了两分钟了，一直在编译，C题

adminlight @ 2018-04-17 21:18:47

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@CynthiaDing: No. It seems your info is correct in DB.

@maisui: No response, read statement carefully. The sample is only a small subset of all test data. AFAIK both Visual C++ 6.0 and the GCC version provided by dev-c++ are very old.

@maisui:
It hangs perhaps because I was running script to detect cheating and the script consume too much DB resource.
I'll manually rejudge it. Thanks for report.

adminlight @ 2018-04-17 21:22:51

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Go to http://acm.xidian.edu.cn/discuss/thread.php?tid=204&cid=1038.

This thread is too long, XDOJ can't display it.

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