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assignment ... assignment

Author SHA1 Message Date
paulusgaming
df5b34216c Solution for assignment3. 2022-12-04 23:34:33 +01:00
3 changed files with 130 additions and 28 deletions
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13
README.md
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@@ -1,5 +1,12 @@
# Advent of Code 2022 - Assignment6_javascript # Advent of Code 2022 - Assignment3 javascript solution
This repository contains answers to the assignments of Advent of Coding 2022 This problem is all about searching for duplicates in strings. The solution is implemented using slice to split the string in half.
The priority is retrieved using the ASCII charcode character for convienence. How to retrieve inputs differs between part1 and 2, therefore a checkbox is provided to toggle between different parsing methods.
## References ## References
- https://stackoverflow.com/questions/28207610/checking-if-the-characters-in-a-string-are-all-unique - https://stackoverflow.com/questions/94037/convert-character-to-ascii-code-in-javascript
- https://stackoverflow.com/questions/20474257/split-string-into-two-parts
- https://www.folkstalk.com/2022/10/find-common-characters-in-two-strings-javascript-with-code-examples.html
- https://stackoverflow.com/questions/351409/how-to-append-something-to-an-array
- https://stackoverflow.com/questions/9862761/how-to-check-if-character-is-a-letter-in-javascript
- https://stackoverflow.com/questions/1966476/how-can-i-process-each-letter-of-text-using-javascript
- https://www.w3schools.com/js/js_arrays.asp

6
index.html
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@@ -8,9 +8,9 @@
<body> <body>
<p>Assignment:</p> <p>Assignment:</p>
<textarea rows="15" cols="50" id="assignment"></textarea> <textarea rows="15" cols="50" id="assignment"></textarea>
<input type="checkbox" id="algorithm" /> <input type="checkbox" id="algorithm"/>
<label for="algorithm">Search for message marker?</label> <label for="algorithm">Solution by compartiment.</label>
<p>Answer:</p> <p>Answer:</p>
<div id="answer">Provide input first</div> <div id="answer">Provide input first</div>
<script src="script.js"></script> <script src="script.js"></script>

139
script.js
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const ASSIGNMENT = 'assignment'; const ASSIGNMENT = 'assignment';
const ANSWER = 'answer'; const ANSWER = 'answer';
const ALGORITHM_CHECKBOX = 'algorithm'; const ALGORITHM_CHECKBOX = 'algorithm';
const MARKER_DISTINCT_CHARACTERS = 4; const CHARCODE_START=64;
const MESSAGE_DISTINCT_CHARACTERS = 14; const CHARCODE_UPPER_CORRECTION=6;
const ERROR_MESSAGE_INVALID_INPUT_SIZE = "Invalid input size, should be higher than 2 for: ";
const ERROR_MESSAGE_INVALID_ITEM_CHARACTER = "Invalid item character found: ";
const NEWLINE_CHARACTER = '\n'; const NEWLINE_CHARACTER = '\n';
/** /**
* Main function * Main function
*/ */
window.onload = function() { window.onload = function() {
document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer); document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer); document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer);
} }
/** /**
@@ -20,8 +22,8 @@ window.onload = function() {
function calculateAnswer(event) { function calculateAnswer(event) {
console.info("Calculating answer for input..."); console.info("Calculating answer for input...");
let assignment = document.getElementById(ASSIGNMENT).value; let assignment = document.getElementById(ASSIGNMENT).value;
let distinctCharacters = (document.getElementById(ALGORITHM_CHECKBOX).checked)? MESSAGE_DISTINCT_CHARACTERS: MARKER_DISTINCT_CHARACTERS; let byCompartiments = document.getElementById(ALGORITHM_CHECKBOX).checked;
let answer = algorithm(assignment, distinctCharacters); let answer = algorithm(assignment, byCompartiments);
document.getElementById(ANSWER).innerText = answer; document.getElementById(ANSWER).innerText = answer;
} }
@@ -31,28 +33,121 @@ function calculateAnswer(event) {
* @param assignment the input from the assignment. * @param assignment the input from the assignment.
* @return string the answer * @return string the answer
*/ */
function algorithm(assignment, distinctCharacters) { function algorithm(assignment, byCompartiments) {
let signal = assignment.trim(); let priorityScoreSum = 0;
let marker = assignment.substring(0,distinctCharacters); let lines = assignment.trim().split(NEWLINE_CHARACTER);
console.info("Linecount:" + lines.length);
for(let i=distinctCharacters; i<signal.length; i++) { let increment = (byCompartiments)? 1:3;
if(containsDistinctCharacters(marker)) { for(let i=0; i<lines.length; i+=increment) {
console.debug("Found marker after:" + i + " characters"); let inputs = [];
return "Marker found after processing: " + i + " characters."; let rucksack = lines[i].replace(/\s/g, ''); // Remove whitespace
}
marker = marker.substring(1, distinctCharacters) + assignment[i]; if(byCompartiments) {
let compartiment1 = rucksack.slice(0, rucksack.length/2);
let compartiment2 = rucksack.slice(rucksack.length/2);
inputs = [compartiment1, compartiment2];
} else {
inputs = [rucksack, lines[i+1].replace(/\s/g, ''), lines[i+2].replace(/\s/g, '')];
}
let duplicate = getDuplicateCharacter(inputs);
if(duplicate < 0) {
console.error(ERROR_MESSAGE_INVALID_INPUT_SIZE + inputs + " on line: " + i);
}
let priorityScore = getPriorityScore(duplicate);
if(priorityScore < 0) {
console.error(ERROR_MESSAGE_INVALID_ITEM_CHARACTER + duplicate + " on line: " + i);
continue;
}
priorityScoreSum += priorityScore;
} }
return "No marker found."; return "SUM priorityscore: " + priorityScoreSum;
} }
/** /**
* Check if string only contains distinct characters. * Calculate the answer to assignment.
* @param String string the string to check * @param assignment the input from the assignment.
* @return true, if string contains only distinct characters * @return string the answer
*/ */
function containsDistinctCharacters(string) { function algorithm1(assignment) {
console.debug("Check marker: " + string); let priorityScoreSum = 0;
return new Set(string).size == string.length; let lines = assignment.trim().split(NEWLINE_CHARACTER);
console.info("Linecount:" + lines.length);
for(let i=0; i<lines.length; i++) {
let rucksack = lines[i].replace(/\s/g, ''); // Remove whitespace
let compartiment1 = rucksack.slice(0, rucksack.length/2);
let compartiment2 = rucksack.slice(rucksack.length/2);
console.debug("Check rucksack" + i, ": " + rucksack + " \n with compartiment1: " + compartiment1 + "\n and compartiment2: " + compartiment2);
for(item of compartiment2) {
if(compartiment1.includes(item)) {
console.debug("Found duplicate: " + item + " in rucksack" + i);
let priorityScore = getPriorityScore(item);
if(priorityScore < 0) {
console.error(ERROR_MESSAGE_INVALID_ITEM_CHARACTER + item + " on line: " + i);
continue;
}
priorityScoreSum += priorityScore;
break;
}
}
}
return "SUM priorityscore: " + priorityScoreSum;
}
/**
* Find duplicate character in inputs.
* @param string[] inputs the inputs to find duplicates in.
* @return char the duplicate character
*/
function getDuplicateCharacter(inputs) {
console.debug("Checking inputs: " + inputs);
if(inputs.length < 2) {
return -1;
}
for(let item of inputs[0]) {
let duplicate = true
for(let j=1; j<inputs.length; j++) {
duplicate = duplicate && inputs[j].includes(item);
}
if(duplicate) {
console.debug("Found duplicate: " + item);
return item;
}
}
}
/**
* Returns priorityscore for given character.
* @param char character the character
* @return int the priorityscore for character or -1 if invalid
*/
function getPriorityScore(character) {
let result=0;
let uppercase = character.toUpperCase();
let lowercase = character.toLowerCase();
// validate character
if( uppercase == lowercase ) {
return -1;
}
if(character == uppercase) { // Switch results for upper and lowercase characters
result -= CHARCODE_UPPER_CORRECTION;
character = lowercase;
} else {
character = uppercase;
}
result += character.charCodeAt() - CHARCODE_START;
return result;
} }