Cisco Software Developer Engineer interview questions

I got selected through university campus. I have four rounds of Interview. All consists of Operating System, Data Structure, Algorithms and Puzzles. Few questions were asked from OOPS concepts also. Interviewers were very nice and helpful. There were couple of puzzles also.

I applied through Cisco job fair and got an over phone interview after one week. The question were all in C programming. The guy asked me to do some bit operations. Count the number of 1's in an integer. Count the number of 0's. Assuming that we have a sorted array with some duplicated number, print the numbers only once in an efficient way.