Leetcode Problem 1191. K-Concatenation Maximum Sum
Leetcode Solutions
Kadane's Algorithm with Prefix and Suffix Sum Optimization
- Calculate the maximum subarray sum for a single instance of the array using Kadane's algorithm.
- Calculate the prefix sum maximum and suffix sum maximum.
- Calculate the total sum of the array.
- If
kis 1, the result is simply the maximum subarray sum from step 1. - If the total sum is negative, the result is the maximum of the subarray sum from step 1 and the subarray sum spanning two instances of the array.
- If the total sum is positive, the result is the maximum of the subarray sum from step 1, and the sum of the entire array multiplied by
(k-2)plus the prefix and suffix sums. - Return the result modulo
10^9 + 7.
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