Currently the test for this problem demands accuracy to the nearest 1/10 millisecond. I see a number of solutions (including mine) resort to cheating to achieve this. I'm not sure whether it is currently possible to solve this problem without cheating.
Most nonzero elements in row
Similar Triangles - find the height of the tree
Solve the set of simultaneous linear equations
Determine the square root
Check if any duplicates in your data
Looking for Squares
Filter AC, pass DC
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