17. Count Pairs whose sum is equal to X
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The problem can be found at the following link:
To solve this problem, I utilize a hash set to store the elements of the first linked list. Then, I iterate through the second linked list, checking if the difference between the target sum and the current element exists in the hash set. If it does, I increment the count of pairs. Finally, I return the count of pairs found.
Time Complexity: O(n + m)
, where n is the number of elements in the first linked list and m is the number of elements in the second linked list.
Auxiliary Space Complexity: O(n)
, where n is the number of elements in the first linked list.
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