Minimum Enclosing Circle

From Codeforces. Minimum enclosing circle / covering. Solve the geometry problem "Minimum Enclosing Circle".

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

Minimum Enclosing Circle

**From Codeforces.** Minimum enclosing circle / covering. Solve the geometry problem "Minimum Enclosing Circle".