Does r=uint64(308436464205151562) make sense? It seems like the argument to uint64 is a double precision number, so you have already lost the precision you are trying to gain by using uint64.
r=uint64(308436464205151562) outputs for uint64(r) 308436464205151562. However, r=308436464205151562 outputs for uint64(r) 308436464205151552. A very small loss in precision, but still a loss. The Challenge set has some numbers that use all the paint if full precision math was used. If residual paint was required as an output then full precision is needed. For solutions using p=p-2*r-1 the errors in r and p may cause issues.
Very novel input parameter adjustment to allow direct solution.
That's Muller's method which is more computationally realiable than Bhaskaracharya's.
Nice bisecting search method and anonymous function for clean appearance.
surface of a spherical planet
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Replicate elements in vectors
intersection of matrices
Rubik's Cube: 30 Moves or Less: Minimum Avg Time
Slitherlink II: Gimmes
GJam 2014 Rd 1c: Reordering Train Cars (Large)
Solve Quadratic : No * - or key functions permitted
Spherical radius given four points
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