Web Reference: In-depth solution and explanation for LeetCode 53. Maximum Subarray in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. We use a variable curSum to track the sum of the elements. At each index, we have two choices: either add the current element to curSum or start a new subarray by resetting curSum to the current element. Maybe you should track the maximum sum at each step and update the global maximum accordingly. Jul 23, 2025 · The simple idea of Kadane's algorithm is to look for all positive contiguous segments of the array (max_ending_here is used for this). And keep track of maximum sum contiguous segment among all positive segments (max_so_far is used for this).
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