3 ms·
if anyone wants a "human" solution 1) there are 4 questions that everyone answered the same way (let's say this earned everyone A points) 2) in the rest of th
by NooneAtAll3 2y ago
if anyone wants a "human" solution
1) there are 4 questions that everyone answered the same way (let's say this earned everyone A points)
2) in the rest of the questions, 7-point and 5-point students gave opposite answers
that means that 7-A (rest of 7-point student's correct answers) equals to 5-(4-A) (rest of 5-point student's incorrect answers)
7-A = 1+A => A=3
That means 3-point student scored 3 points together with everyone else, and answered rest of the questions wrong
From this it's trivial to find the hidden score and why there are 4 possible answer keys
- thaumasiotes 2y agoIt seems to have been designed to be easy to solve by hand. My approach: 1. Dan and Lisa agree on 8 out of 10 answers. 2. Dan, by changing two of Lisa's answers, has gained 20 points. Dan is right about both of those answers (6 and 9). 3. Mary is wrong about answers 6 and 9. 4. Mary has a total of three mistakes. 5. There are 8 possible answer keys, because Mary only has one mistake left to distribute among the other 8 answers. 6. On four of those possible answer keys, Lisa scores 50 points. Those are invalid. 7. Mary's mistake must be in answer to question 1, 3, 7, or 8. 8. On all four of those questions, Colin agrees with Mary. 9. Colin scores 30 points collectively on questions 1, 3, 7, and 8, plus 10 points each on questions 2, 5, and 9. 60 points.
- moomin 2y agoIt definitely has been designed to be solved by hand or possibly even in your head. Nintendo aren't in the habit of handing out Advent of Code questions in their games. Honestly, the sophistication of the puzzle design is extremely admirable.