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Some C++ generic template algorithms I have implemented. They are by no mean the best.
This is a helper function that perform skip_by n -> iter -> enumerate -> filter(i % n == 0)
The same logic as group_by
but applies fold
on every group.
The idea is to only have dp
as std::set<IntTy>
.
We can get back the tuple by decomposing this value since we know that each combination of 2s,3s, and 5s are unique.
This reduces memory usage by a third.
It will also make searching and inserting very trivial and cheap because of std::set
.
As of the latest changes to util::generic::group_by
, util::generic::group_by_minify
is just a special case of the former.
There are 2 other ways to perform group_by
that performs a lot less allocations:
<Value, Frequency>
instead.The idea is to split every element into its own group, then each group determines how to glob. Only the globbing that will decrease the sum the most will succeed. Repeat until the number of groups available is as desired.
Few reasons:
For example, ListNode should satisfy ForwardIterator named requirement.
For example, an iteration of the integer 12345
return 1
, 2
, 3
, 4
, and 5
.
AFAIK, std::unordered_set
is a little bit more expensive than a simple std::vector
Simply delete
the trees after you test them.
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