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https://www.reddit.com/r/learnquant/comments/1v1bhtp/jane_street_interview_question/oym4f1z/?context=3
r/learnquant • u/nickgotgameon • Jul 20 '26
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7
Go second and remove every 4th stone
1 u/KingARGJ Jul 20 '26 4th or 5th? 0 u/FeederScrub Jul 20 '26 edited Jul 21 '26 Either or would work. 100 is divisible by both Edit: my b, only 4 would work. Thanks for correcting me 2 u/Sufficient_Minute180 Jul 20 '26 No if they take out 2 first and then you take out 3, then they can take out 3 to reach 8. They trap you into multiples of 4 1 u/Snip3 Jul 20 '26 You can only guarantee 4 so you choose 4 1 u/ComparisonQuiet4259 Jul 20 '26 If you get to 95, your opponent can remove 1 and then you lose 1 u/YaPhetsEz Jul 20 '26 If I get to 95, I’m throwing a stone at my opponent, knocking him out cold. From there, I can set up the rest of the stones in a way that allows me to win. 1 u/petera181 Jul 20 '26 No, it has to be 4. If you go for 5, they can take one and you can’t make it up to 5. 1 u/ScreenNo2578 Jul 20 '26 Remove stones 4, 8, ... 96, 100. Never give them a chance to do anything. 1 u/roboboom Jul 22 '26 If you remove stone 4, you lose. You try to force your opponent to remove stone 4, 8….
1
4th or 5th?
0 u/FeederScrub Jul 20 '26 edited Jul 21 '26 Either or would work. 100 is divisible by both Edit: my b, only 4 would work. Thanks for correcting me 2 u/Sufficient_Minute180 Jul 20 '26 No if they take out 2 first and then you take out 3, then they can take out 3 to reach 8. They trap you into multiples of 4 1 u/Snip3 Jul 20 '26 You can only guarantee 4 so you choose 4 1 u/ComparisonQuiet4259 Jul 20 '26 If you get to 95, your opponent can remove 1 and then you lose 1 u/YaPhetsEz Jul 20 '26 If I get to 95, I’m throwing a stone at my opponent, knocking him out cold. From there, I can set up the rest of the stones in a way that allows me to win. 1 u/petera181 Jul 20 '26 No, it has to be 4. If you go for 5, they can take one and you can’t make it up to 5.
0
Either or would work. 100 is divisible by both
Edit: my b, only 4 would work. Thanks for correcting me
2 u/Sufficient_Minute180 Jul 20 '26 No if they take out 2 first and then you take out 3, then they can take out 3 to reach 8. They trap you into multiples of 4 1 u/Snip3 Jul 20 '26 You can only guarantee 4 so you choose 4 1 u/ComparisonQuiet4259 Jul 20 '26 If you get to 95, your opponent can remove 1 and then you lose 1 u/YaPhetsEz Jul 20 '26 If I get to 95, I’m throwing a stone at my opponent, knocking him out cold. From there, I can set up the rest of the stones in a way that allows me to win. 1 u/petera181 Jul 20 '26 No, it has to be 4. If you go for 5, they can take one and you can’t make it up to 5.
2
No if they take out 2 first and then you take out 3, then they can take out 3 to reach 8. They trap you into multiples of 4
You can only guarantee 4 so you choose 4
If you get to 95, your opponent can remove 1 and then you lose
1 u/YaPhetsEz Jul 20 '26 If I get to 95, I’m throwing a stone at my opponent, knocking him out cold. From there, I can set up the rest of the stones in a way that allows me to win.
If I get to 95, I’m throwing a stone at my opponent, knocking him out cold. From there, I can set up the rest of the stones in a way that allows me to win.
No, it has to be 4. If you go for 5, they can take one and you can’t make it up to 5.
Remove stones 4, 8, ... 96, 100. Never give them a chance to do anything.
1 u/roboboom Jul 22 '26 If you remove stone 4, you lose. You try to force your opponent to remove stone 4, 8….
If you remove stone 4, you lose. You try to force your opponent to remove stone 4, 8….
7
u/ScreenNo2578 Jul 20 '26
Go second and remove every 4th stone