did codeforces just remove c++11 from the compile languages
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Yes. We cannot submit codes in C++11. We could only submit C++14 or higher versions of C++.
Topcoder disagree
inb4 usaco removes c++11
It's a interesting thing that China Computer Federation don't let competitors use c++11 as well.
They only let us use c++98 :(
Sad, Codeforces has removed C++11 but CCF still only let us use C++98 :(
(In 2077.)
CCF: We can use C++14!!!
Fun fact: In NOI Linux 1.4.1, which is still in use in NOI 2021, the gcc version is 4.8.4, which does not even fully support C++14 features.
Now that the GCC version has been updated to 9.3.0, let's pray that the CCF will allow the use of C++17 in future contests XD
98 > 11
But now, CCF let us use C++14.
deleted
Me who revised 4 times to see what the comment is
Good.
I hope they add C++20 with GCC 11.2. There are many useful features there.
I only know of three-way comparision operator, default == operator and initializer in for-each loop. Kindly let us know if you know anything more that will be useful in CP.
Concepts, templated lambdas,
std::ranges,std::span, andstd::formatsound like pretty useful features.std::midpointwill do away with a lot of midpoint related overflow/underflow issues, which is a good thing too.There's also a prefix and suffix comparison on strings, which will reduce the amount of code written for brute force string problems. Also, for containers like
std::mapandstd::set, you will be able to check if an element exists using something likeif (a.contains(element)), which would be better than the much more dangerousif (a.count(element))which blows up to $$$O(frequency)$$$ for multisets.For some (warning: very rare) constant-factor optimization,
[[likely]]and[[unlikely]]attributes would be a compiler-agnostic feature (no more using GCC's __builtin_expect anymore, so yay). Also as someone told me yesterday, C++20's[[no_unique_address]]can be useful for optimizing away empty structs.My use-case was making an optionally lazy sparse persistent segment tree, and I was aiming to have the least memory usage possible, but to my dismay empty structs inside structs had a size of 1 byte, which when combined with padding gives an effective extra size of 8 bytes, and I had to do code duplication with some constexpr tricks for reducing memory usage.
Also everything in the
<bit>header, no more ugly intrinsics.I've been using c++11 just because I already had it installed on my computer. Any recommendations on whether to upgrade to 14, 17, or directly to 20?
I would say C++17, it's a bit premature to upgrade to 20
HackerRank.com has already included C++20 among its compiler options in the C++ practice problems section. Perhaps it is time for the Codeforces team to consider installing C++20.
I am glad to use C++20 with GCC 11.2 here.