Specification

nurses' information

•   all nurse's working time is [8:00,12:00] and [13:00,18:00]

•   for problem 1 and 2, all nurses start from the same location (50,50)

•   for problem 3 and 4:

            nurse station 1: (18,2)  3 nurses

            nurse station 2: (55,60) 4 nurses

            nurse station 3: (81,70) 10 nurses

            nurse station 4: (91,21) 6 nurses