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Common Elements In Three Sorted Arrays
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Common Elements In Three Sorted Arrays

Contributed by
Vishal Modani
Medium
yellow-spark
0/80
Avg time to solve 35 mins
Success Rate 65 %
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26 upvotes

Problem Statement

You are given three arrays 'A', 'B' and 'C' of length 'N', 'M' and 'K' respectively. All the three arrays are sorted in non-decreasing order. Your task is to find all such elements which are present in all the three given arrays.

Note:

1. The output array should have the same ordering of elements as the original arrays.
2. Even if a particular element appears more than once in each of the three arrays, it should still be present only once in the output array.
3. If there are no common elements in the arrays, return an empty array.

For example:

Consider the three arrays A = [ 2, 3, 4, 7 ] , B = [ 0, 0, 3, 5 ] , C = [ 1, 3, 8, 9 ]
The output array should be [ 3 ] as 3 is the only element which is present in all the three arrays.
Detailed explanation ( Input/output format, Notes, Constraints, Images )

Sample Input 1:

2
4 3 3
1 4 5 6
3 4 5 
5 6 7
3 1 3
4 6 8
6
2 2 6

Sample Output 1:

5
6

Explanation for Sample Input 1:

For the first test case : 
Elements that are common in array A and B = [ 4, 5 ]. Out of which only 5 is present in Array C. Therefore the output array is [ 5 ] in this case.

For the second test case : 
It can be seen that only 6 is present in all the three arrays. Therefore the output array is [ 6 ] in this case.

Sample Input 2:

2
4 4 3
1 2 2 3
2 2 3 3
2 2 3
3 2 2
1 2 3
0 6
4 6

Sample Output 2:

2 3 

Explanation for Sample Input 2:

For the first test case, elements 2,3 are present in all three arrays.
For the second test case, no element is common in all three arrays, hence we do not print anything.
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