case 5 failed: expected count 3, got 6
input:
3 2
-10 0
7 6
-8 2
expected centers: [{-18 2} {-1 8} {-3 6}]
got output:
6
-10.0000000000 0.0000000000
-9.0000000000 1.0000000000
-8.0000000000 2.0000000000
-1.5000000000 3.0000000000
-0.5000000000 4.0000000000
7.0000000000 6.0000000000