3010. Divide an Array Into Subarrays With Minimum Cost I

You are given an array of integers nums of length n. The cost of an array is the value of its first element. For example, the cost of [1,2,3] is 1 while the cost of [3,4,1] is 3. You need to divide nums into 3 disjoint contiguous subarrays. Return the minimum possible sum of the cost of these subarrays. Example 1: Input: nums = [1,2,3,12] Output: 6 Explanation: The best possible way to form