Problem Description
Given a 0-indexed integer array nums, determine whether there exist two subarrays of length 2 with equal sum. Note that the two subarrays must begin at different indices. Return true if these subarrays exist, and false otherwise.
Key Insights
- A subarray is a contiguous sequence of elements within an array.
- We only need to check pairs of adjacent elements to calculate their sums.
- Using a hash table (or dictionary) allows us to store and check for duplicate sums efficiently.
Space and Time Complexity
Time Complexity: O(n)
Space Complexity: O(n)
Solution
To solve the problem, we iterate through the array and calculate the sum of each subarray of length 2. We store each sum in a hash table (or dictionary) and check if the sum already exists in the table. If it does, we have found two subarrays with equal sums and can return true. If we finish the loop without finding duplicates, we return false.