Receipt arithmetic: Proof strip
Inputs
readings is a list of integers (numbers with no decimal part). It may be empty, and numbers may repeat unless task 1 says otherwise.
Your tasks
- Create a list
adjusted. For each number x inreadings, multiply x by 2, then add 3. Put each answer inadjusted. Keep the original order. For example, 4 becomes 11, and -2 becomes -1. - Complete
receiptArithmeticProofStripso it returnsadjusted. Return it, do not print it.
Example
If readings is [8, 8, 8, -8, 8], then adjusted is [19, 19, 19, -13, 19] and receiptArithmeticProofStrip returns [19, 19, 19, -13, 19].
Rules
- If
adjustedis empty, return [].
Test data
TEST DATA 1: readings is [0, -8, 14, 2, 14].
TEST DATA 2: readings is [9, -8, 9, 9].
Examples
Input: readings = [0,-8,14,2,14] Output: [3,-13,31,7,31]
adjusted is [3, -13, 31, 7, 31]. receiptArithmeticProofStrip returns that whole list, so return [3, -13, 31, 7, 31].
Input: readings = [9,-8,9,9] Output: [21,-13,21,21]
adjusted is [21, -13, 21, 21]. receiptArithmeticProofStrip returns that whole list, so return [21, -13, 21, 21].
Input: readings = [] Output: []
adjusted is []. receiptArithmeticProofStrip returns that whole list, so return [].
Input limits
- 0 <= input size <= 64.
- Answers fit in a signed 32-bit integer: -2,147,483,648 through 2,147,483,647.
- Input numbers have no decimal part. They range from -1,000,000 to 1,000,000. Follow any extra input rules in task 1.
Efficiency goal
Big-O describes how the work or memory needed grows as the input gets larger.
Efficiency goal: time O(n); extra memory, including the helper list, O(n). n is the input length. These labels describe how work and memory grow with the input.
Practice focus
Build adjusted first, then return exactly what the tasks ask for. Follow the order, keep repeated values when the rule says so, and check the empty case.