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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Seems to me when it hit dead ends, which end in 1, it pops twice since range(1-1, 0, -1) skips the for loop. next loop starts with the poped value-1.
Clever and simple. Nice job!
I would very much like to see your diagram but the link is dead...
I start from scratch without knowing the existance of the Euler's theorem. After long ways of modifying my code back and forth, I ended up with my own version of Euler's theorem, but less succinct. So I think the best way to solve this problem is by applying the theorem directly. The key part is that for a^n where both a and n are large, you don't need to worry about a actually. It's easy to do exponential on very large number a as long as n is small. So you can easily do a^0, a^1, a^2, a^3 as long as n is reduced to range(4).
This solution seems very clear but I can't follow it...
I missed the important clue "all tested puzzle are determinable" and spent several days trying to solve a general puzzle. The blog "Solving Every Sudoku Puzzle" by Peter Norvig is a good guide for general case. For this "easy test", it's much simplier...
I looked into constrained programming but ended up with brute-force search... I guess implementing a general solution(not brute-force) to 6by6 or more will be much more tedious. I think it's a good idea to tackle the Sudoku solver beforing trying the 6by6 one
Old kata syndrome ;-)
I think this kata doesn't fit in 4kyu. It should be 5kyu or maybe 6kyu.
By printing step by step I can see it works. But I don't quite understand how it get over with iterating to an dead end...
You're not the only one that feel like this...