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# PFDS 11.2.2

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### PFDS 11.2.2

1. 1. PFDS 11.2Catenable Double-Ended Queues~ using implicit recursive slowdown ~ @rf0444
2. 2. Simple Implementationdata Cat a = Shallow (Deq a) | Deep (Deq a) (Cat (Deq a)) (Deq a)
3. 3. Simple Implementation ++
4. 4. Simple Implementation cons snoc
5. 5. Simple Implementation
6. 6. Simple Implementation( ++ )
7. 7. Simple Implementation( ++ ) 再帰 O(min(log n1, log n2))
8. 8. using compound elementsdata Cat a = Shallow (Deq a) | Deep (Deq a) (Cat (Ele a)) (Deq a) (Cat (Ele a)) (Deq a)
9. 9. using compound elementsdata Ele a = Simple (Deq a) | Compound (Deq a) (Cat (Ele a)) (Deq a)
10. 10. using compound elements ++
11. 11. using compound elements
12. 12. using compound elements
13. 13. using compound elements snoc cons
14. 14. using compound elements
15. 15. using compound elements
16. 16. using compound elementstail1. f が 4 要素以上 f a m b r2. a の先頭が Simple3. a の先頭が Compound4. a が空、b の先頭が Simple5. a が空、b の先頭が Compound6. a も b も空
17. 17. using compound elementstail (1)
18. 18. using compound elementstail (1)
19. 19. using compound elementstail (2)
20. 20. using compound elementstail (2)
21. 21. using compound elementstail (2)
22. 22. using compound elementstail (3)
23. 23. using compound elementstail (3)
24. 24. using compound elementstail (3)
25. 25. using compound elementstail (3)
26. 26. using compound elementstail (3) ++
27. 27. using compound elementstail (3)
28. 28. using compound elementstail (3)
29. 29. using compound elementstail (4) 空
30. 30. using compound elementstail (4) 空
31. 31. using compound elementstail (4)
32. 32. using compound elementstail (4)
33. 33. using compound elementstail (4) 空
34. 34. using compound elementstail (5) 空
35. 35. using compound elementstail (5) 空
36. 36. using compound elementstail (5)
37. 37. using compound elementstail (5)
38. 38. using compound elementstail (5)
39. 39. using compound elementstail (5)
40. 40. using compound elementstail (6) 空 空
41. 41. using compound elementstail (6) 空 空
42. 42. using compound elementstail (6) ＊どちらかのサイズが 3 以下なら、くっつけて Shallow
43. 43. using compound elementstail (6)
44. 44. using compound elementstail (6) 空 空