Setup
You are given a list of people and their current net worth in U.S. Dollars. Some people might have a positive net worth, others could have a negative net worth (i.e. are in debt), while some are just broke.
There are many friendships across these financial groups. No single person is alone typically, you can draw a friendship line from one person to any other person through x number of people. In this community, each person gives 1 dollar to each of their friends. Additionally, each person can take 1 dollar from each of their friends.
Who should take or give a dollar so that everyone has a non-negative balance?
Input
Your function giveAndTake will pass two arguments
-
people- a hash object with names as keys and net worth as value. -
friendships- an array of pairs of names that are friends.
Output
Your function should return an array of 'moves'. Each 'move' is an array of two elements: The name of a person and the value 1 or -1. 1 indicates they should take a dollar from each friend. -1 indicates they should give a dollar to each friend.
For example: [['David',1], ['Brian',-1], ['Alice',-1], ['Charlie',1]]
Tests
people: {Adam: 1, Bob: -1, Carol: -2, Donna: 2, Eddie: 3}
friendships: [['Adam','Carol'],['Adam','Eddie'],['Bob','Carol'],['Carol','Eddie'],['Donna','Eddie']]
people: {Adam: -4, Bob: 1, Carol: 2, Donna: 2, Eddie: 0}
friendships: [['Adam','Donna'],['Adam','Carol'],['Bob','Carol'],['Carol','Eddie'],['Donna','Eddie']]
people:{Adam: 0, Bob: 2, Carol: -2, Donna: 3, Eddie: -2}
friendships:[['Adam','Carol'],['Adam','Donna'],['Bob','Carol'],['Carol','Eddie'],['Donna','Eddie']]
Good luck!
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Top comments (2)
Are people allowed to bring themselves and/or their friends into debt? If they are allowed, then the order of moves is not important - only the final number times each person given minus the final number of times they have taken.
My attempt... There is no givers in my cruel world. Just steal/take from friends.
gist.github.com/aiibe/91b8de9c9fde...