SymPy | Python中的 Permutation.unrank_nonlex()

Permutation.unrank_nonlex() ：unrank_nonlex()是一个 sympy Python库函数，它是一种不尊重字典顺序的线性时间排序算法。

Syntax : sympy.combinatorics.permutations.Permutation.unrank_nonlex()

Return : linear time unranking.

代码 #1：unrank_nonlex() 示例

# Python code explaining
# SymPy.Permutation.unrank_nonlex()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from 
# sympy.combinatorics.permutations.Permutation.unrank_nonlex() method 
  
# creating Permutation
a = Permutation([[2, 0], [3, 1]])
  
b = Permutation([1, 3, 5, 4, 2, 0])
  
  
print ("Permutation a - unrank_nonlex form : ", a.unrank_nonlex(2, 5))
print ("Permutation b - unrank_nonlex form : ", b.unrank_nonlex(1, 6))

输出 ：

Permutation a – unrank_nonlex form : (1)
Permutation b – unrank_nonlex form : (0)

代码 #2：unrank_nonlex() 示例

# Python code explaining
# SymPy.Permutation.unrank_nonlex()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from 
# sympy.combinatorics.permutations.Permutation.unrank_nonlex() method 
  
# creating Permutation
a = Permutation([[2, 4, 0], 
                 [3, 1, 2],
                 [1, 5, 6]])
  
  
print ("Permutation a - unrank_nonlex form : ", a.unrank_nonlex(2, 8))

输出 ：

Permutation a – unrank_nonlex form : (0 1)