Maximize the Number of Equivalent Pairs After Swaps

To maximize the number of equivalent pairs after swaps, you can follow these steps:

1. Identify the pairs that are already equivalent in the given array or list.
2. Sort the array or list to group equivalent elements together.
3. Initialize a variable to count the number of equivalent pairs.
4. Iterate through the sorted array or list and count the number of equivalent pairs for each group of equivalent elements.
5. Add the count of equivalent pairs for each group to the variable initialized in step 3.
6. Return the final count of equivalent pairs.

Here is an example implementation in Python:

def countEquivalentPairs(nums):
    equivalent_pairs = 0
    
    # Step 1: Identify the pairs that are already equivalent
    for i in range(len(nums)):
        for j in range(i+1, len(nums)):
            if nums[i] == nums[j]:
                equivalent_pairs += 1
    
    # Step 2: Sort the array or list
    nums.sort()
    
    # Step 3-5: Count the number of equivalent pairs for each group
    i = 0
    while i < len(nums):
        j = i + 1
        count = 1
        while j < len(nums) and nums[i] == nums[j]:
            count += 1
            j += 1
        equivalent_pairs += count * (count - 1) // 2
        i = j
    
    return equivalent_pairs

Hope this helps! Let me know if you have any further questions.