Yuchang_Zhu's blog

I'm so mad!
By Yuchang_Zhu, history, 21 month(s) ago, In English

I'm so mad that C is wrong because I got the wrong data type!

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21 month(s) ago, # |
← Rev. 2   Vote: I like it +6 Vote: I do not like it

Don't be mad, take it as experience for later contests.

(Yesterday I used the wrong datatype for problem B, submitted and locked the problem immediately without optimizing the code. I was so careless and got TLE on test 9. After finished the contest, I just changed a few lines of code and it was Accepted. What a pity!)

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21 month(s) ago, # |
  Vote: I like it +4 Vote: I do not like it

Join the #define int long long cult! Everyone hates us, and they got a point, but this kind of mistake won't ever happen to you again

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21 month(s) ago, # |
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A good way to avoid these mistakes is to do a mental estimation of the upper bound of the absolute value before assigning datatypes. For example, if there's an array with $$$\le 2 \cdot 10^5$$$ elements between $$$-10^9$$$ and $$$10^9$$$, any subset sum of this array will be between $$$\pm 2 \cdot 10^{14}$$$, which clearly needs a 64-bit integer type. I try to be as specific about the bounds as possible, and it helps me verify my implementation as well, so I'd recommend others to do this too.

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21 month(s) ago, # |
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Me too!

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