The problem is pretty stupid, if there's only one test case. Then you can just return the correct result for this test case, without really computing anything (which is what the "best" solution to this problem does.
Replace NaNs with the number that appears to its left in the row.
Make one big string out of two smaller strings
Rotate and display numbered tile
Do you like your boss?
Find the elements of a matrix according to a defined property.
Duplicate each element of a vector.
Matrix with different incremental runs
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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