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NahC0el's blog

Why does this code run for about 5s with C++20 but 1.2s with C++17/23?
By NahC0el, history, 21 month(s) ago, In English

C++20: 304481417 TLE. Then I run it in mushup contest to see it's real running time.

C++23: 304515752

C++17: 304490984

  • Vote: I like it
  • -14
  • Vote: I do not like it

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21 month(s) ago, hide # |
 
Vote: I like it +23 Vote: I do not like it

Just ask chatgpt, no one is going to analyze your spagetty shltcode.

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    21 month(s) ago, hide # ^ |
     
    Vote: I like it 0 Vote: I do not like it

    I've asked it to o3-mini but it told me c++20 should be faster. This is an unusal phenomenon that c++20 slower than c++17 and 23 for 4 times, so I ask for help with community.

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21 month(s) ago, hide # |
 
Vote: I like it -9 Vote: I do not like it

I think it's because of the better optimizers in C++23

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21 month(s) ago, hide # |
 
Vote: I like it -8 Vote: I do not like it

https://codeforces.me/blog/entry/126654

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