caterpillar
min-max 3
1 2 3 | 3 - 0 = 3
4 6 7 | 7 - 5 = 2
5 | 5 - 5 = 0
min-sum 5
1 2 3 4 5 | 5 - 0 = 5
6 | 6 - 6 = 0
7 | 7 - 7 = 0
