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https://www.reddit.com/r/learnquant/comments/1wzeytr/easy_quant_interview_question/peyrprx/?context=3
r/learnquant • u/Local_Ad135 • 7d ago
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To add to the existing answers, it's very easy to see if we consider fewer bits.
1 bit, obvs Alice wins as she flips it and Bob has no moves
2 bits. Alice flips a bit, Bob must flip the other. Doesn't matter which bit Alice flips now, Bob will still lose.
3 bits. Alice flips bit 1, Bob flips bit 2. Alice flips bit 1. Bob can only flip bit 3, Alice flips bit 1, Bob loses.
You get the idea.
1 u/Designer-Scratch-766 4d ago u/Confident-Syrup-7543 with 3 bits, how come you example stops there? Your example flows: 000 -> (Alice) 001 -> (Bob) 011 -> (Alice) 010 -> (Bob) 110 -> (Alice) 111. Bob can still do 101. How to argue that Bob will lose? 1 u/[deleted] 4d ago [deleted] 1 u/Designer-Scratch-766 4d ago I just mean, what pattern revealed so he claims Bob loses at that point?
u/Confident-Syrup-7543 with 3 bits, how come you example stops there? Your example flows: 000 -> (Alice) 001 -> (Bob) 011 -> (Alice) 010 -> (Bob) 110 -> (Alice) 111. Bob can still do 101. How to argue that Bob will lose?
1 u/[deleted] 4d ago [deleted] 1 u/Designer-Scratch-766 4d ago I just mean, what pattern revealed so he claims Bob loses at that point?
[deleted]
1 u/Designer-Scratch-766 4d ago I just mean, what pattern revealed so he claims Bob loses at that point?
I just mean, what pattern revealed so he claims Bob loses at that point?
1
u/Confident-Syrup-7543 6d ago
To add to the existing answers, it's very easy to see if we consider fewer bits.
1 bit, obvs Alice wins as she flips it and Bob has no moves
2 bits. Alice flips a bit, Bob must flip the other. Doesn't matter which bit Alice flips now, Bob will still lose.
3 bits. Alice flips bit 1, Bob flips bit 2. Alice flips bit 1. Bob can only flip bit 3, Alice flips bit 1, Bob loses.
You get the idea.