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Problem

Submissions

Merge Two Sorted Arrays Without Extra Space

Contributed by

Shivam Ruhil

Medium

0/80

2 upvotes

Problem Statement

Ninja has two sorted arrays ‘A’ and ‘B’, having ‘N’ and ‘M’ elements respectively. You have to help Ninja to merge these two arrays ‘A’ and ‘B’ such that the resulting array is also sorted.

Note:

You must perform the merge operation in place and must not allocate any extra space to merge the two arrays.

For example:

When ‘N’ = 4, ‘A’ = {1, 4, 5, 7} and ‘M’ = 3, ‘B’ = {2, 3, 6}. 
We can merge these two arrays into {1, 2, 3, 4, 5, 6, 7} (The elements of ‘A’ are underlined).
Hence, the answer is {1, 2, 3, 4, 5, 6, 7}.

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line contains two integers ‘N’ and ‘M’, denoting the sizes of ‘A’ and ‘B’ respectively.
The second line contains ‘N’ integers denoting the elements of ‘A’.
The third line contains ‘M’ integers denoting the elements of ‘B’.

Output Format:

You must merge the two sorted arrays in place. The smallest ‘N’ elements should be in ‘A’, and the greatest ‘M’ elements should be in ‘B’. You don’t have to return anything. The system will print ‘A’ + ‘B’, where ‘+’ denotes concatenation.

Constraints:

1 <= N <= 10^5
1 <= M <= 10^5
0 <= A[i] <= 10^9
0 <= B[i] <= 10^9

The sum of ‘N + M’ over all test cases does not exceed 2 * 10^5.
Time Limit: 1-sec

Sample Input 1:

3 4
1 8 8
2 3 4 5

Sample Output 1:

1 2 3 4 5 8 8

Explanation Of Sample Input 1:

We have ‘A’ = {1, 8, 8} and ‘B’ = {2, 3, 4, 5}. 
Merging the two arrays results in {1, 2, 3, 4, 5, 8, 8}.
Hence the answer is {1, 2, 3, 4, 5, 8, 8}, where ‘A’ contains {1, 2, 3} and ‘B’ contains {4, 5, 8, 8}.

Sample Input 2:

4 5
1 1 1 1 
2 2 3 3 5

Sample Output 2:

1 1 1 1 2 2 3 3 5

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