some solutions to cse160 hw
hw4:https://courses.cs.washington.edu/courses/cse160/22au/homework/hw4/homework4.html hw5:https://courses.cs.washington.edu/courses/cse160/22au/homework/hw5/homework5.html hw6:https://courses.cs.washington.edu/courses/cse160/22au/homework/hw6/homework6.html