What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Most nonzero elements in row
Program an exclusive OR operation with logical operators
Back to basics 10 - Max Float
Back to basics 11 - Max Integer
Swap two numbers
Find out base of following arithmetic operation
Find out sum and carry of Binary adder
Union of two set decreasing order
Convert number from given base to other base
Cumulative product of a vector
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