two sum in Java
Understand the Problem
The question is asking for a solution to the 'two sum' problem using the Java programming language, which typically involves finding two numbers in an array that add up to a specific target value.
Answer
The 'Two Sum' problem can be solved using a hashmap in O(n) time in Java.
The 'Two Sum' problem in Java involves finding indices of two numbers in an array that add up to a given target. This can be solved using a hashmap to achieve O(n) time complexity.
Answer for screen readers
The 'Two Sum' problem in Java involves finding indices of two numbers in an array that add up to a given target. This can be solved using a hashmap to achieve O(n) time complexity.
More Information
Using a hashmap is efficient because it allows you to store elements and their indices as key-value pairs. For each element, you can check if the complement (target - element) exists in the hashmap, allowing for quick look-ups and insertion during iteration.
Tips
A common mistake is not handling duplicate numbers properly, which might lead to incorrect index pairings.
Sources
- Two Sum - LeetCode - leetcode.com
- Two sums in Java from leetcode - Stack Overflow - stackoverflow.com
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