Write a function that accepts as input a vector and returns the same vector, but retaining only the first occurrence of an element whenever there is consecutive repetition of this element.
Example:
in -> [1 2 2 2 3 4 4 3 5] out-> [1 2 3 4 3 5]
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Sum of diagonal of a square matrix
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Find perfect placement of non-rotating dominoes (easier)
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Return the first and last character of a string
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