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.
First non-zero element in each column
Find number of days
Cell Counting: How Many Draws?
letter yes yes & letter no no
given 3 sides, find area of this triangle
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