Find sum of negative elements in row.
Example x=[1 -5 3 4 -6 6 7 8 9 10]
result = -11
Return a list sorted by number of occurrences
Given a window, how many subsets of a vector sum positive
Wrapping the Tower of Pisa
Solve Linear equations
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Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Find hen's weight.
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