Problem title
Difficulty
Avg time to solve

Set Matrix Zeros
Easy
30 mins
Beautiful String
Easy
18 mins
Yogesh And Primes
Moderate
20 mins
Swap Two Numbers
Easy
10 mins
First Missing Positive
Moderate
18 mins
Longest Univalue Path
Moderate
10 mins
Find Unique
Easy
--
Valid Sudoku
Moderate
40 mins
Reverse Nodes in k-Group
Hard
56 mins
Sum Of Max And Min
Easy
10 mins 234

# First Missing Positive

Difficulty: MEDIUM
Avg. time to solve
18 min
Success Rate
84%

Problem Statement

#### For example, the input [3, 4, -1, 1] should give output 2 because it is the smallest positive number that is missing in the input array.

##### Input format:
``````The first line of input contains a single integer T, representing the number of test cases or queries to be run.
Then the T test cases follow.

The first line of each test case contains a positive integer N which represents the length of the array.

The second line of each test case contains N integers representing the elements of the array 'ARR'.
``````
##### Output Format :
``````For each test case, print a single integer denoting the minimum positive integer that is missing from the given input array.

Th output of each test case will be printed in a separate line.
``````
##### Note:
``````You do not need to print anything. It has already been taken care of. Just implement the given function.
``````
##### Constraint :
``````1 <= T <= 10
1 <= N <= 10^5
-10^5 <= ARR[i] <= 10^5

Time Limit: 1 sec
``````
##### Sample Input 1 :
``````1
5
3 2 -6 1 0
``````
##### Sample Output 1:
``````4
``````
##### Explanation for Input 1:
``````The first positive number is 1 and it is present in the array similarly 2 and 3 are also present in the array. 4 is missing from the array. Thus, the minimum positive integer that is missing is 4.
``````
##### Sample Input 2 :
``````1
5
0 1 2 3 4
``````
##### Sample Output 2:
``````5
``````   Console