I solved, but the solution is wrong, there is no 60th minute in analog clocks (test case 20). Do not try to use mod until they fix it.
Nice trick with the 222.2 - very clever!
Vectorize the digits of an Integer
Set some matrix elements to zero
Length of a short side
Solve the Sudoku Row
Project Euler: Problem 16, Sums of Digits of Powers of Two
Specific Element Count
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