# 1429 First Unique Number

You have a queue of integers, you need to retrieve the first unique integer in the queue.

Implement the `FirstUnique` class:

• `FirstUnique(int[] nums)` Initializes the object with the numbers in the queue.
• `int showFirstUnique()` returns the value of the first unique integer of the queue, and returns -1 if there is no such integer.
• `void add(int value)` insert value to the queue.

Example 1:

``````Input:
[[[2,3,5]],[],[5],[],[2],[],[3],[]]
Output:
[null,2,null,2,null,3,null,-1]
Explanation:
FirstUnique firstUnique = new FirstUnique([2,3,5]);
firstUnique.showFirstUnique(); // return 2
firstUnique.add(5);            // the queue is now [2,3,5,5]
firstUnique.showFirstUnique(); // return 2
firstUnique.add(2);            // the queue is now [2,3,5,5,2]
firstUnique.showFirstUnique(); // return 3
firstUnique.add(3);            // the queue is now [2,3,5,5,2,3]
firstUnique.showFirstUnique(); // return -1
``````

Example 2:

``````Input:
[[[7,7,7,7,7,7]],[],[7],[3],[3],[7],[17],[]]
Output:
[null,-1,null,null,null,null,null,17]
Explanation:
FirstUnique firstUnique = new FirstUnique([7,7,7,7,7,7]);
firstUnique.showFirstUnique(); // return -1
firstUnique.add(7);            // the queue is now [7,7,7,7,7,7,7]
firstUnique.add(3);            // the queue is now [7,7,7,7,7,7,7,3]
firstUnique.add(3);            // the queue is now [7,7,7,7,7,7,7,3,3]
firstUnique.add(7);            // the queue is now [7,7,7,7,7,7,7,3,3,7]
firstUnique.add(17);           // the queue is now [7,7,7,7,7,7,7,3,3,7,17]
firstUnique.showFirstUnique(); // return 17
``````

Example 3:

``````Input:
[[[809]],[],[809],[]]
Output:
[null,809,null,-1]
Explanation:
FirstUnique firstUnique = new FirstUnique([809]);
firstUnique.showFirstUnique(); // return 809
firstUnique.add(809);          // the queue is now [809,809]
firstUnique.showFirstUnique(); // return -1
``````

Constraints:

• `1 <= nums.length <= 105`
• `1 <= nums[i] <= 108`
• `1 <= value <= 108`
• At most `50000` calls will be made to `showFirstUnique` and `add`.
 `````` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 `````` ``````class FirstUnique: def __init__(self, nums: List[int]): self.list = [] self.dict = {} # Dict[int, bool] self.pointer = 0 for n in nums: self.add(n) def showFirstUnique(self) -> int: while ( self.pointer < len(self.list) and not self.dict[self.list[self.pointer]] ): self.pointer += 1 return ( -1 if self.pointer == len(self.list) else self.list[self.pointer] ) def add(self, value: int) -> None: if value in self.dict: self.dict[value] = False else: self.dict[value] = True self.list.append(value) # Your FirstUnique object will be instantiated and called as such: # obj = FirstUnique(nums) # param_1 = obj.showFirstUnique() # obj.add(value)``````