if the matrix has a zero, return true. else, return false
Sort a list of complex numbers based on far they are from the origin.
Test for balanced parentheses
Determine Whether an array is empty
ベクトル [1 2 3 4 5 6 7 8 9 10] の作成
BASICS - sum part of vector
find the 'M'
Sum the rows
Make an identity matrix whose diagonal elements are 1:n
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