Please add more tests to deter hardcoded solutions (see Solution 1472301).
Great use of recursion. Unfortunately, this solution should fail the updated test suite due to performance (time out) for cases n>36;
Thanks for the tip off. By the way, it turns out that in the updated Test Suite there is an inherent imprecision (or 'tolerance') of about ±64 in the stated 'correct' result for n=70: see Solution 1528518. On the other hand, you could enforce exact solutions even for n=70 as suggested in Solution 1528517 (like Problem 44628). —DIV
In the code f(1), f(2) & f(3) are defined, but never used.
David Verrelli, yes, they are never used. I forgot to remove those lines. Thanks!
Find the sum of the elements in the "second" diagonal
The sum of the numbers in the vector
angle in regular polygon
Can the given sides form a triangle?
Sum of adjacent elements in a vector
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