Problem 76. De-dupe

good!

http://www.mathworks.com/help/matlab/ref/unique.html
Why bother coding what has already been coded?

Hello, amin nazari.
Congratulations on devising your own script to satisfy the test cases.
As a point of feedback, I suggest that this function may not be robust/general enough to handle any possible combinations of values in an input vector.
On line c(1,m(ff))=0 zero is introduced as a 'marker' in the new vector c. Given that c was defined as being offset by 10000000 from a, this is equivalent to using a 'marker' value of -10000000 in the vector a.
Suppose that the input vector a were provided as [-10000000 2 2 1]. The above function would then immediately set c = [0 10000002 10000002 10000001]. Notice that a 'genuine' value of zero has occurred, which cannot be distinguished from the 'marker' value that is later introduced, and the correct result could therefore not be obtained for this input.