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There is no restriction placed by the interviewer on the secondary storage. So we can use it I suppose.
- rishi.b.agrawal February 02, 20121. Read the integers in file1 one by one and make files with that name.
2. Open the second file and read the integers one by one. For every integer you read check the existence of the file.
3. If the file exists then print the integer as common.
It O(n+m) solution i.e. O(n).