Na2a's blog

By Na2a, history, 8 months ago, In English,

Hello, Codeforces!

Yesterday, in CF Round 366 my friend Birjik encountered a strange problem. His correct code was receiving Runtime Error in sample case.

Take a look at these codes:
Runtime error
Accepted

As you can notice, one code has these lines:

ios_base::sync_with_stdio(0);
cin.tie(0);

Strange, isn't it?
As I have understood, this happens because of an array called read.
Renaming that array solves this problem.

Long story short, using ios_base / cin.tie receives runtime error if we have a variable named read in our code.
Be careful!

 
 
 
 
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8 months ago, # |
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cin/cout — зло

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    8 months ago, # ^ |
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    глобальные переменные — зло

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    8 months ago, # ^ |
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    looks like everyone is mad at you for resigning your job :D

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    8 months ago, # ^ |
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    welcome to cf

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8 months ago, # |
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Workarounds: mark the variable static, put it into an anonymous namespace, put it into a named namespace/class, or don't use global variables.