IBM Online Assessment -On Campus-2 Coding Problems

I recently completed an IBM Online Assessment and wanted to share the coding questions I encountered.

Platform:HackerRank Time:70 minutes

Question 1 – Make the Array Alternating in Parity

Given an array of positive integers, find the minimum number of operations required to make the array alternate in parity.

The final array can follow either of these patterns:

• Odd, Even, Odd, Even, ...
• Even, Odd, Even, Odd, ...

Operation

In one operation, you can replace any element:

nums[i] = floor(nums[i] / 2)

You can perform the operation on the same element multiple times.

Example

nums = [6, 12, 5, 10]

For the pattern:

Even, Odd, Even, Odd

We can transform:

6  -> 6       (Even)
12 -> 6 -> 3  (Odd)   -> 2 operations
5  -> 2       (Even)  -> 1 operation
10 -> 10      (Even)

So the total is:

3 operations

For the pattern:
odd, even, odd, even

We can transform:

6  -> 3       (odd) -> 1 operations
12 ->         (Even)  
5  -> 2       (odd)  
10 -> 10      (Even)

So the answer is:

1 operation

Another example:

nums = [3, 12, 5, 10]

The array is already:

Odd, Even, Odd, Even

so the answer is:

0

If considering a transformation such as:

6 -> 3

that costs one operation.

Constraints

1 <= nums.size() < 10^5
nums[i] > 0

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Question 2 – Maximum Number of Valid Pairs

Given two arrays arr1 and arr2, and an integer d, form the maximum number of pairs (arr1[i], arr2[j]) satisfying:

arr1[i] <= arr2[j] <= arr1[i] + d

Each element can be used in at most one pair.

Example

arr1 = [8, 20, 35, 45]
arr2 = [25, 50]
d = 10

Possible valid pairs include:

(20, 25)   because 20 <= 25 <= 30

(45, 50)   because 45 <= 50 <= 55

Therefore:

Answer = 2

Constraints

1 <= arr1.size(), arr2.size() <= 10^5
1 <= d <= 10^5

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These were the two coding questions I encountered in my IBM OA.

I used AI tool to enhance the post but the question I share is based on my personal recollection I takes some valuable time to write this post so i requested to like ,share and also I am available to answer any comments.

IBM OA Experience – On Campus-Two Coding Questions