ABC033D — Triangle Classification

From AtCoder. Acute/right/obtuse classification from 3 points. Solve the geometry problem "ABC033D — Triangle Classification".

Examples
Input: [1,2,3]
Output: 0
Hints

ABC033D — Triangle Classification

**From AtCoder.** Acute/right/obtuse classification from 3 points. Solve the geometry problem "ABC033D — Triangle Classification".