Connection
Base URL, credentials and a reachable server.
Product
Product features · Lexicographic permutation unranking
01
Place rank fixtures next to ordering-sensitive callers and inspect which remaining item each factorial-sized block selects, keeping the external indexing convention explicit.
Selection
A model available through the configured endpoint.
Capabilities
Context limits and tool support are determined by the model and server.
Lexicographic permutation unranking
● ● ●LexiNest●
A concrete starting point · Lexicographic permutation unranking ×
from math import factorial
def unrank_permutation(size, rank):
if type(size) is not int or not 0 <= size <= 10:
raise ValueError("size 0 through 10")
if type(rank) is not int or not 0 <= rank < factorial(size):
raise ValueError("rank outside permutation count")
available, result = list(range(size)), []
for remaining in range(size,0,-1):
index, rank = divmod(rank, factorial(remaining-1))
result.append(available.pop(index))
return result✳Recover the lexicographic permutation of size zero through ten at an integer rank.
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