It can be found that the number on the edge will only be used once, while the number in the middle position will be used twice.

take for example

5 4

2 3 1

2+3 = 5,3+1= 4, and the last 3 was used twice to participate in the last 9 miles.

Then, in order to ensure that the top is the highest, just make sure that the number on the edge is the largest and the number inside is the smallest.

Starting from 1 (the default value of 0 cannot be used)

Here, it takes the form of an inverted triangle.

5 4 1 2 3 6

9 5 3 5 9

14 8 8 14

22 16 22

38 38

76