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Possible Duplicate:
remove duplicate elements in an array in O(n) in C/C++
How can I remove duplicate elements from an array?
array [ ] = {1,2,3,4,5,1,2,4,9,0,0}
array [ ] = {0,1,2,3,4,5,9}
Sort the array using your favorite sorting algorithm.
Walk through the array and eliminate duplicates – if a value is the same one as the previous one, keep going forward until you get a new value and then copy it back.