make all the elements in given x zero.
Simple but fun
I'm not sure this would work if there is a 0 in x...
Who invented zero?
Determine the length of a string of characters
Flip the vector from right to left
Values in Array
Where is the number that you want to find?
Make an identity matrix whose diagonal elements are 1:n
true or false
Sum the rows
find the 'M'
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