Numbers puzzle

i don't do ect

a=7 b=4 c=12 d=2 e=8 f=9 g=3 h=10 i=13 j=16 k=1 l=6 m=17 n=5 o=11 p=15 q=14

Wow. Thanks

A tricks used or is there a method ?

I wrote a program. There is only one solution.

If I were to try to do this by hand, I'd start with the triangles that sum to 42 and 14 since they have the fewest possible combinations. However, I think this would be quite difficult to solve by hand.