[HELP NEEDED]: Insane Bug in C++20 Solution

Good evening CodeForces,today I tried solving https://oj.uz/problem/view/JOI16_selling_rna. My code has a very weird behaviour. To start, compiling in C++20 takes so long that I guess oj.uz marks it as compilation error. The same code gets AC in C++17 (and compiles instantly on my machine). See here:

https://oj.uz/submission/1277541

https://oj.uz/submission/1277540

Another weird behavior I encountered while implementing is if you switch the vector ids; with set ids; in the Node struct, and change the push_back's with insert's, it causes an infinite loop I wasn't able to put my finger on. Also if one compiles the set solution with glibcxx, the following error message is produced (which I'm unable to use to my advantage)

Spoiler

/usr/include/c++/13/debug/safe_iterator.h:298:
In function:
    gnu_debug::_Safe_iterator<_Iterator, _Sequence, _Category>::reference 
    gnu_debug::_Safe_iterator<_Iterator, _Sequence, _Category>::operator*() 
    const [with _Iterator = std::_Rb_tree_const_iterator<long long int>; 
    _Sequence = std::debug::set<long long int>; _Category = 
    std::forward_iterator_tag; reference = const long long int&]

Error: attempt to dereference a past-the-end iterator.

Objects involved in the operation:
    iterator "this" @ 0x7ffc5d7fbeb0 {
      type = std::_Rb_tree_const_iterator<long long> (constant iterator);
      state = past-the-end;
      references sequence with type 'std::debug::set<long long, std::less<long long>, std::allocator<long long> >' @ 0x581c1076de90
    }
Aborted (core dumped)

Please help me since I had a similar problem with c++20 before at an important exam (I had compilation TLE on cms on a very simple code which I dont have access to rn)

Rev.	By	When	Δ	Comment
en4	Seferoglu	2025-10-09 21:27:11	4
en3	Seferoglu	2025-10-09 20:16:35	6
en2	Seferoglu	2025-10-09 20:16:03	22
en1	Seferoglu	2025-10-09 20:15:32	1832	Initial revision (published)

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en4