League Table Update

Problem

Update a league table after one game.

Each row is [name, wins, losses, rating]. Increment the winner's wins and the loser's losses, then apply a fixed K = 16 Elo update to both ratings (winner scored 1.0, loser 0.0). Return the updated table as deep copies.

Hint

Ratings are read before the game and updated only after both tallies change.

Test cases

case 1

in: [[["A",5,3,1520],["B",4,4,1480],["C",6,2,1600]],"A","B"]

expected: [["A",6,3,1527.0830138598033],["B",4,5,1472.9169861401967],["C",6,2,1600]]

case 2

in: [[["X",0,0,1500],["Y",0,0,1500]],"Y","X"]

expected: [["X",0,1,1492],["Y",1,0,1508]]

case 3

in: [[["A",1,0,1550],["B",0,1,1450]],"B","A"]

expected: [["A",1,1,1539.7589600031538],["B",1,1,1460.2410399968462]]

Starter codePython

def league_table_update(table, winner, loser):
    # Your code here
    pass

3 test cases · run your code against them in the editor