回答編集履歴
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追記
test
CHANGED
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@@ -15,3 +15,55 @@
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正直、初めて[Array#bsearch](https://docs.ruby-lang.org/ja/latest/method/Array/i/bsearch.html) / [Enumerable#chunk](https://docs.ruby lang.org/ja/latest/method/Enumerable/i/chunk.html)を使ったような気がします。
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**追記**
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```ruby
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arr = [1,2,3,4,5,6,7,8,9,10]
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offsets = [2, 4, 7]
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p arr.each_with_index.slice_when{|_, (_, i)|
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if offsets.first == i
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offsets.shift
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end
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}.map{|a| a.map(&:first)}
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```
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オフセット→要素数への変換ができるのならば
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```ruby
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arr = [1,2,3,4,5,6,7,8,9,10]
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elements = [2, 2, 3]
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result = []
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result << arr.shift(elements.shift) until elements.empty?
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result << arr
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p result
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```
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が速いとは思います。
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