Hello, Andriy Kavetsky. The tolerance in test 2 of the Test Suite is quite strange. As written, it seems that a result that is 1000 times larger than the true answer would be accepted as adequate. See Problem 44690 & Problem 44691 for some alternative cues. Also, it is recommended that at least four cases be provided in a Test Suite, though more are often necessary to prevent hard-coded workarounds. —DIV
First non-zero element in each column
MATCH THE STRINGS (2 CHAR) very easy
Number of digits in an integer
06 - Matrix Equations 3
Sum of series I
Get derivarive of polynomial given as vector array.
Solve expression III
Sum positive elements of matrix.
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