A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Great Circle Distance
Find the sum of the elements in the "second" diagonal
Matrix which contains the values of an other matrix A at the given locations.
Compute Fibonacci Number
Negation and new variables
Chess ELO rating system
Permute diagonal and antidiagonal
Decrypt the cypher using XOR encryption (for beginners)
Add more zeros
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