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  1. def UltimosN(L, n, L2=[]):
  2.     if not n:
  3.         return L2
  4.     L2.append(L[-1])
  5.     return UltimosN(L[:-1], n-1, L2)
  6.  
  7. print(UltimosN([1,2,3,4,5], 3))
  8.  
  9.  
  10.  
  11. def invertir(L):
  12. 	return L[::-1]
  13.  
  14. def combinaciones(L, n):
  15.     if len(L) == n:return [L]
  16.     if not n:return [[ ]]
  17.     c = []
  18.     for i in combN(L[1:], n - 1):  
  19.         c.append([L[0]] + i)
  20.     c += combN(L[1:], n)
  21.     return c
  22.  
  23.  
  24. def permutaciones(L):
  25.     if len(L) <= 1:
  26.         return [L]  
  27.     c = []
  28.     for i in range(len(L)):
  29.         for j in permutaciones(L[:i] + L[i+1:]):  
  30.             c.append([L[i]] + j)  
  31.     return c
  32.  
  33. print(permutaciones(["A", "B", "C","D"]))
  34.  
  35. def nextPerm(L):
  36.     i= len(L)-2
  37.     j= len(L) -1
  38.     while i >= 0 and L[i] >=L[i+1]:
  39.         i -= 1
  40.     if i ==-1:return L[::-1]
  41.     while L[j] <= L[i]:
  42.         j -= 1
  43.     L[i], L[j] = L[j], L[i]
  44.     x,y = i+1, len(L)-1
  45.     while x < y:
  46.         L[x],L[y] = L[y],L[x]
  47.         x+=1
  48.         y-=1
  49.     return L
  50.  
  51.  
Success #stdin #stdout 0.05s 9652KB
comments (?)
stdin 
Standard input is empty
stdout 
[5, 4, 3]
[['A', 'B', 'C', 'D'], ['A', 'B', 'D', 'C'], ['A', 'C', 'B', 'D'], ['A', 'C', 'D', 'B'], ['A', 'D', 'B', 'C'], ['A', 'D', 'C', 'B'], ['B', 'A', 'C', 'D'], ['B', 'A', 'D', 'C'], ['B', 'C', 'A', 'D'], ['B', 'C', 'D', 'A'], ['B', 'D', 'A', 'C'], ['B', 'D', 'C', 'A'], ['C', 'A', 'B', 'D'], ['C', 'A', 'D', 'B'], ['C', 'B', 'A', 'D'], ['C', 'B', 'D', 'A'], ['C', 'D', 'A', 'B'], ['C', 'D', 'B', 'A'], ['D', 'A', 'B', 'C'], ['D', 'A', 'C', 'B'], ['D', 'B', 'A', 'C'], ['D', 'B', 'C', 'A'], ['D', 'C', 'A', 'B'], ['D', 'C', 'B', 'A']]
https://ideone.com/SJO11a
language:
Python 3 (python  3.9.5)
created:
12 days ago
visibility:
public

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