Two Sum LeetCode: HashMap Magic (O(n) Solution) | From Brute Force скачать в хорошем качестве

Two Sum LeetCode: HashMap Magic (O(n) Solution) | From Brute Force

The optimal Two Sum solution! After brute force (watch part 1), I transform it to O(n) using HashMap—store seen numbers, check complements instantly. Key concepts: target - nums[i] lookup Map stores value → index Single pass, O(n) time, O(n) space Github: https://github.com/Jamunashri123/DSA-... #L eetCode #HashMap #JavaScript #TechInterview Initializing a new map (1:02-1:07). Iterating through the array with a single for loop (1:17-1:27). This helps achieve an O(n) time complexity (4:35-4:43). Checking for the "remaining value" in the map (1:29-2:06). If found, the indices of the two numbers that sum to the target are returned (2:09-2:20). Storing the number and its index in the map if the remaining value is not found (2:24-2:45). The speaker clarifies that the key is the number and the value is its index (2:49-2:55). The video concludes with a successful run of the code, showing the correct indices for the given example (3:57-4:03).