叉差cha
2019-9-17 19:51:36
我遇過jane street round 2 interview 問題：30 min
4 ppl each with a 30-faced dice
Each roll one by one
Highest grouped with lowest
Middle two grouped tgt
Your pnl = difference in average of the two groups
E.g. u roll 5 others roll 123 then ur payoff is 3-2.5 = 0.5
The question is if ur the second to roll the dice, which number rolled by the first player would maximize ur expect value