Agree with @aquapt because they will also need to pony up dollars for flights, health insurance, rents-if you decide to move out of the dorms, car/auto insurance/uber and food. LA living ain’t cheap, so get them ready for some sticker shock.
Most of the UC’s are impacted for certain majors. If you’re okay with being locked into the major, then you can’t get frustrated if you try to change out and they (Bruins staff) reiterate that CS is impacted.
Good luck! Don’t place your parents in a financial bind. You are only allowed to take loans of $27K TOTAL, from the federal government, over the 4 years of your education. Your parents are going to have to figure out how to fund $300K for UCLA tuition/fees over 4 years without including the expenses that I have noted above. You have a really good deal with UW and it makes more sense than being stuck in freshman math classes of 400+ students at UCLA.