tungwaiyip.info

home

about me

links

Blog

< February 2010 >
SuMoTuWeThFrSa
  1 2 3 4 5 6
7 8 910111213
14151617181920
21222324252627
28      

past articles »

Click for San Francisco, California Forecast

San Francisco, USA

 

Refrigerator Madness solution (Facebook programming puzzle)

Refrigerator Madness is the second Facebook programming puzzle I have tried. The problem description is complicated. I won't try to repeat it here but to suggest you to refer to the original facebook page.

To solve this problem it is necessary to see through the smokescreen. Instead of thinking how much Red Bull a Facebook engineer likes to drink, it is easier to map it to a problem known as Two-Sided Matching. A model with intuitive meaning is a marriage matchup between a group of man and woman. Each man has his list of preferred woman and each woman has her list of preferred man. The marriage is considered stable if there are no two people of opposite sex who were not married to each other but would both prefer to be.

For the Refrigerator Madness problem just map the engineer from the upper 50th percentile to "man" and lower 50th percentile to "woman" (or vice versa). The matching condition is equivalent to the stable marriage criteria.

At this point the problem can be solved by applying the Gale-Shapley algorithm. Write the code and it's done!

2010.02.22 [] - comments

 

 

blog comments powered by Disqus

past articles »

 

BBC News

 

Covid-19: Top adviser warns France at 'emergency' virus moment (25 Jan 2021)

 

Chinese and Indian troops 'in new border clash' (25 Jan 2021)

 

China takes new foreign investment top spot from US (25 Jan 2021)

 

Egypt's dreams of democracy still alive? (25 Jan 2021)

 

Covid-19: Mexican President López Obrador tests positive (25 Jan 2021)

 

Heatwave sweeps Australian cities and raises bushfire danger (25 Jan 2021)

 

Russia Navalny protests: Kremlin hits out at West as it downplays rallies (25 Jan 2021)

 

Boeing 737 Max cleared to fly again 'too early' (25 Jan 2021)

 

Taiwan reports large incursion by Chinese warplanes for second day (25 Jan 2021)

 

North Korea diplomat 'defects to South Korea': Reports (25 Jan 2021)

more »

 

SF Gate

 

Fired Boeing CEO is now working with Bay Area tractor startup (14 Dec 2020)

 

PG&E bills to rise over per year on average to fund wildfire risk reduction (5 Dec 2020)

 

Nasdaq seeks more diversity on boards of companies listed on exchange (2 Dec 2020)

 

Elizabeth Holmes Prosecutors Say Texts Show Theranos Beset With Problems (24 Nov 2020)

 

Ship traffic, November 1 (30 Oct 2020)

 

Ship traffic, November 2 (30 Oct 2020)

more »


Site feed Updated: 2021-Jan-24 09:00