maximum_units_on_a_truck.py

class Solution:
    def maximumUnits(self, boxTypes: List[List[int]], truckSize: int) -> int:
	    boxTypes.sort(key = lambda x : -x[1])
	    max_units = 0
	    for box in boxTypes:
		    if truckSize < 0:break
		    max_units += min(truckSize, box[0]) * box[1]
		    truckSize -= box[0]
	    return max_units