Microsoft Interview Question for Software Developers


Country: United States
Interview Type: In-Person




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Algorithm.

Assumptions:

1. Numbers are 4 byte integers.
2. Total memory 16 GB, Most of them memory used for loading numbers from persistent storage

1. Load, say, 1 GB numbers
2. Sort them using some sorting algorithm, like quick sort
3. Store/transfer sorted numbers back to persistent storage
4. Load next 1 GB numbers and repeat 1 to 3
5. Load 100 MB numbers from each 1 GB, and merge 10 chunks
6. Repeat this process for all 100 MB chunks of each 1 GB.
7. Repeat this merge process, until all numbers are sorted.

- Anonymous June 06, 2018 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Under these assumptions I would do this:
* Create a bit array of 2**32 bits (only 512MB required).
* Load the huge array by blocks that fit in memory
* If a number in the block has been seen before (bit corresponding to this number is set), output it as a duplicate, otherwise set the bit.

- adr June 09, 2018 | Flag Reply


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