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Leetcode 46 Permutations

Given a collection of distinct numbers, return all possible permutations.

For example,
[1,2,3] have the following permutations:

[  [1,2,3],  [1,3,2],  [2,1,3],  [2,3,1],  [3,1,2],  [3,2,1]]
# @param {Integer[]} nums# @return {Integer[][]}def permute(nums)    return [[]] if nums.empty?    a = Array.new(nums).map{|x| [x]}    while a[0].length < nums.length        b = Array.new()        a.each do |x|            (nums-x).each {|y| b << x + [y]}        end        a = b    end    aend

 

Leetcode 46 Permutations