Leetcode Problem 454. 4Sum II

454. 4Sum II

Leetcode Solutions

Initialize a hashmap m to store the frequency of sums of pairs from nums1 and nums2.
Iterate over all elements a in nums1 and b in nums2, and add the sum a + b to the hashmap, incrementing the count if the sum already exists.
Initialize a count cnt to 0 for the number of valid tuples.
Iterate over all elements c in nums3 and d in nums4, and for each pair, check if the negation -(c + d) exists in the hashmap m.
If it exists, add the frequency of -(c + d) from the hashmap to cnt.
Return the count cnt.

Programming Language

Purpose:

General Question

Debug My Code

image/screenshot of info(optional)

Full Screen