Leetcode 3457. Eat Pizzas!

Given n (a multiple of 4) pizza weights, partition them into n/4 days of 4 pizzas each so that on odd days you gain the largest pizza of that day and on even days you gain the second-largest; maximize the total gained weight by choosing the grouping and day order optimally. This is a combinatorial grouping/ordering optimization problem driven by values' relative ordering.