Comments
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You're confused about the meaning of the word require.
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That's very consistent progress, keep it up!
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By the way, C doesn't require DP. D does require DP (I think).
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That would be quite a thing to need to divide by zero...

Anyways, you want your program to blow up on coding mistakes, not fail silently.
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I'm not saying that no technique is needed to solve all the problems. But problems A and B usually don't require any previous knowledge.

That's why it's called the beginner contest.
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Python solution:

cnt = [Counter(map(int, input().split())) for _ in range(3)]

print(sum(prod(cnt[i][p[i]] / 6 for i in range(3)) for p in permutations([4, 5, 6])))
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There are no prerequisite techniques to compete in the beginner contest. He's learning this idea by upsolving the problem.
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Why do you return zero for division by zero? That's a weird function.
+3

Make it n + 1 if you prefer. The point is that consecutive numbers are always coprime.
+8

Or you can choose n — 1.
+3

Closeness is not transitive.
On MladenP → the ko_osaga interview, 6 months ago
+3

Your interviews are a great contribution to the community, thank you! Hope you keep doing them, even if online!
-8

Now that you're a master, have you crossed out any item of the list? :-)
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Persistence in problem solving is a good thing. As long a you have ideas to investigate, keep working on it. And if you use ChatGPT, make sure it doesn't spoil the problem, and only provides hints, and ideas to investigate.
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If we're talking about problems that you expect to solve, e.g. A or B, then it's better if you can come up with the solution on your own. If you're upsolving and you get stuck for a while, you can consider asking ChatGPT for hints, before giving up.
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If you have trouble performing under contest pressure, don't just practice calmly, do more contests or virtual participations. But also upsolve the problems you couldn't solve during the (virtual) contests.
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Yes, of course. And still LeetCode detects hundreds of cheaters on every contest with this technique. No cheating detection technique is perfect.
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Have you considered using prompt injection for cheating detection? LeetCode uses that technique very effectively.