https://leetcode.com/problems/permutations-ii/

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/**
 * @param {number[]} nums
 * @return {number[][]}
 */
const permuteUnique = function(nums) {
    let res = []
    const search = function(nums, tmp = [], used = {}) {
        if (tmp.length === nums.length) {
            return res.push([...tmp])
        }
        for (let i = 0; i < nums.length; i++) {
            if (used[i])
                continue
            tmp.push(nums[i])
            used[i] = true
            search(nums, tmp, used)
            tmp.pop()
            used[i] = false
        }
    }
    search(nums)
    res = [...new Set(res.map(v => JSON.stringify(v)))].map(v => JSON.parse(v))
    return res
}