LeetCode 1480 Running Sum of 1D Array | Prefix Sum Explained for Beginners | Python Solution

In this video, we solve LeetCode 1480: Running Sum of 1D Array using Python. This is an easy problem, but it teaches one of the most important DSA concepts: prefix sum. We will understand: What running sum means How to traverse a 1D array How to maintain a cumulative sum Why prefix sum is useful How to write clean Python code How to avoid common index mistakes Problem: Given an array nums, return an array where runningSum[i] is the sum of nums[0] to nums[i]. Example: Input: nums = [1, 2, 3, 4] Output: [1, 3, 6, 10] This problem is perfect for beginners who are starting DSA and want to build strong fundamentals before moving to harder array and prefix sum problems. Code language: Python Topic: Arrays, Prefix Sum Difficulty: Easy Watch till the end for dry run, complexity analysis, and common mistakes. #LeetCode #DSA #Python #PrefixSum #CoinsLive