2] have the following unique permutations: [   [1,1,2],   [1,2,1],   [2,1,1] ] """ def permute_unique(nums):     perms = [[]]

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Given a collection of numbers that might contain duplicates,
return all possible unique permutations.
For example,
[1,1,2] have the following unique permutations:
[
  [1,1,2],
  [1,2,1],
  [2,1,1]
]
"""


def permute_unique(nums):
    perms = [[]]
    for n in nums:
        new_perms = []
        for l in perms:
            for i in range(len(l)+1):
                new_perms.append(l[:i]+[n]+l[i:]). 

 

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