1980. Find Unique Binary String

Medium

923

36

Given an array of strings `nums`

containing `n`

**unique** binary strings each of length `n`

, return *a binary string of length *`n`

* that does not appear in *

`nums`

**Example 1:**

Input:nums = ["01","10"]Output:"11"Explanation:"11" does not appear in nums. "00" would also be correct.

**Example 2:**

Input:nums = ["00","01"]Output:"11"Explanation:"11" does not appear in nums. "10" would also be correct.

**Example 3:**

Input:nums = ["111","011","001"]Output:"101"Explanation:"101" does not appear in nums. "000", "010", "100", and "110" would also be correct.

**Constraints:**

`n == nums.length`

`1 <= n <= 16`

`nums[i].length == n`

`nums[i]`

is either`'0'`

or`'1'`

.- All the strings of
`nums`

are**unique**.

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