Programming

The Two Sum problem involves finding indices of two numbers in an array that add up to a target. The brute force method is inefficient (O(n²)), while the hash map approach is faster (O(n)), highlighting the importance of efficient problem-solving techniques.

Starting my Leetcode journey, I tackled the Contains Duplicate problem. The brute force solution has O(n²) complexity, while using a set improves efficiency to O(n). This highlights the value of sets for quick existence checks in programming challenges.

The Valid Anagram problem checks if two strings are anagrams. The brute force method is inefficient (O(mn)), while sorting improves it to O(m log(m) + n log(n)). Using a hash map offers the best efficiency at O(m+n), balancing speed and memory.