Remainder boxes: Positive-ink invoice
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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
boxCounts. There are five boxes, numbered 0 to 4. For each number x inreadings, find its box with ((x % 5) + 5) % 5. The % symbol means remainder. This formula also gives a box for negative numbers: -1 goes in box 4. Count the numbers in each box.boxCountsmust contain five counts, in box order 0, 1, 2, 3, 4. - Add only the numbers in
boxCountsthat are greater than 0. Store the sum inpositiveTotal. - Complete
remainderBoxesPositiveInkInvoiceso it returnspositiveTotal. Return it, do not print it.
Example
If readings is [9, 4, 12, 9, -6], then boxCounts is [0, 0, 1, 0, 4] and remainderBoxesPositiveInkInvoice returns 5.
Rules
- Skip zeros.
- If no number is greater than 0, return 0.
Test data
TEST DATA 1: readings is [-8, 0, 4, 4, 20].
TEST DATA 2: readings is [4, 4, -5, 4].
Examples
Input: readings = [-8,0,4,4,20] Output: 5
boxCounts is [2, 0, 1, 0, 2]. Keep [2, 1, 2] and add those numbers. Return 5.
Input: readings = [4,4,-5,4] Output: 4
boxCounts is [1, 0, 0, 0, 3]. Keep [1, 3] and add those numbers. Return 4.
Input: readings = [] Output: 0
boxCounts is [0, 0, 0, 0, 0]. Keep [] and add those numbers. Return 0.
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 boxCounts 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.