3500. Minimum Cost to Divide Array Into Subarrays

You are given two integer arrays, nums and cost, of the same size, and an integer k. You can divide nums into subarrays. The cost of the ith subarray consisting of elements nums[l..r] is: - (nums[0] + nums[1] + ... + nums[r] + k * i) * (cost[l] + cost[l + 1] + ... + cost[r]). Note that i represents the order of the subarray: 1 for the first subarray, 2 for the second, and so on. Return the min