Eyad_Hantouli's blog

Something weird related to the versions of C++ compilers
By Eyad_Hantouli, history, 23 months ago, In English

Yesterday, I solved Problem B in Educational Codeforces Round 167 (Rated for Div. 2), but when I submitted the solution using GNU C++20 13.2 (64 bit, winlibs), the system gave me a runtime error. (Submission Link: https://mirror.codeforces.com/contest/1989/submission/267808899)

I didn't know what caused this error, so I changed the compiler to GNU C++14 6.4.0, and somehow I got accepted! (Submission Link: https://mirror.codeforces.com/contest/1989/submission/267843646)

Does anyone have any explanation?

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19 months ago, hide # |
 
Vote: I like it 0 Vote: I do not like it 
    for (ll i = 0; i <= b.size() - length; ++i)
        substrings.insert(b.substr(i, length));

当 i==b.size()-length 时，b.substr(i,length) 会造成访问越界。

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19 months ago, hide # |
 
Vote: I like it 0 Vote: I do not like it 
    for (ll i = 0; i <= b.size() - length; ++i)
        substrings.insert(b.substr(i, length));

Sorry, I forgot to use English.

When i==b.size()-length，b.substr(i,length) may cause out_of_range。

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