Ribbon runs: Total receipt
Inputs
line is text. A character is one letter, digit, space, or punctuation mark.
Your tasks
- Create a list
runLengths. A run is a group of matching characters next to each other. End a run only when the character changes or the text ends. Record the length of each run, from left to right. Spaces count as characters too. For "aa bb",runLengthsis [2, 1, 2]. - Add up every number in
runLengths. Store the sum intotal. - Complete
ribbonRunsTotalReceiptso it returnstotal. Return it, do not print it.
Example
If line is "ab wak", then runLengths is [1, 1, 2, 1, 1, 1] and ribbonRunsTotalReceipt returns 7.
Rules
- If
runLengthsis empty,totalis 0.
Test data
TEST DATA 1: line is "tmmlz yqqqn".
TEST DATA 2: line is "MM mMM".
Examples
Input: line = "tmmlz yqqqn" Output: 11
runLengths is [1, 2, 1, 1, 1, 1, 3, 1]. Add its numbers to get 11. Return 11.
Input: line = "MM mMM" Output: 6
runLengths is [2, 1, 1, 2]. Add its numbers to get 6. Return 6.
Input: line = "" Output: 0
runLengths is []. Add its numbers to get 0. 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.
- The text uses ASCII characters (a basic character set). Only an ordinary space separates words.
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 runLengths 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.