Chimp And Workout

Chimp has bought N blocks each with a specific height(h1,h2,h3,….hn) for workout. Let x1,x2,…….xn be an ordering of blocks where xi represents the height of blocks . A workout is consists of N jumps, the first jump is from ground to x1, then from x1 to x2, x2 to x3 and so on till we reach xn. Difficulty of workout is defined as sum of heights of all jumps. Height of a jump is defined as |xi – xi