I've console logged the t,k, ts of the fails I'm getting because I couldn't figure out the problem but I still can't understand it. I'd appreciate if somebody could shed a light on why this is happening.

ERROR 1: part of the basic tests. Why should 168 equal to 178?
'''Log
163 3 [ 50, 55, 56, 57, 58 ]
163 3 [ 50 ]
230 3 [
91, 74, 73, 85,
73, 81, 87
]
331 2 [ 81, 87 ]

expected 168 to equal 178'''

ERROR 2: why should this be null?
'''Log
1277 4 [
445, 69, 140, 426,
279, 85, 144, 68,
463, 204, 440, 342
]
It should work for random tests too: expected 1265 to equal null'''