21 Aug PYTHON
Question 1: Getting the Data
Dr. Nam Bo Phan approached QHR with a problem to solve. She has recently learnt of a process digitSquareSum() that takes a number and returns the sum of the squares of each of its digits. She asked her assistant Ken Nothad to build a list of results for the numbers 1 to 500.
X
digitSquareSum(x)
1
1
2
4
…
…
Ken got started on the list, but got tired of punching the digits in his calculator. Dr. Phan would like us to produce this list.
Requirements
- Implement digitSquareSum()
- Implement a function questionOne() that returns a Java File object for a CSV file that has the following data populated:
- 1 -> 1
- 89 -> 145 -> 42 -> 20 -> 4 -> 16 -> 37 -> 58 -> 89
- Implement a function questionTwo() that returns the ascending numbers as a comma-separated String (e.g. 1,7,10,…)
- Implement a method questionThree() to determine how many starting numbers between 1 and 10 million inclusively take more than 7 executions of digitSquareSum() to reach an 89.
- questionThree() should be optimized for speed.
1,1
2,4
3,9
…
500,25
Question 2: Forming the Link
Dr. Phan has found that by performing digitSquareSum() multiple times, two numbers get back to their original number:
She asked Ken to identify which of the original numbers, between 1 and 500, will arrive at 1 after multiple iterations of performing digitSquareSum(). Ken is threatening to quit.
Requirements
Question 3: Taking on the World
Ken has called QHR to say that Dr. Phan has been rocking in her chair and going on about world domination. Her latest request has Ken fearing for his sanity and his life.
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