Solution for assignment3.

2022-12-04 23:34:33 +01:00
3 changed files with 130 additions and 28 deletions
--- a/README.md
+++ b/README.md
@@ -1,5 +1,12 @@
-# Advent of Code 2022 - Assignment6_javascript
-This repository contains answers to the assignments of Advent of Coding 2022
+# Advent of Code 2022 - Assignment3 javascript solution
+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
- 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
--- a/index.html
+++ b/index.html
@@ -8,9 +8,9 @@
  <body>
    <p>Assignment:</p>
    <textarea rows="15" cols="50" id="assignment"></textarea>
-    <input type="checkbox" id="algorithm" />
-    <label for="algorithm">Search for message marker?</label>
-    
+    <input type="checkbox" id="algorithm"/>
+    <label for="algorithm">Solution by compartiment.</label> 
+
    <p>Answer:</p>
    <div id="answer">Provide input first</div>
    <script src="script.js"></script>
--- a/script.js
+++ b/script.js
@@ -1,16 +1,18 @@
 const ASSIGNMENT = 'assignment';
 const ANSWER = 'answer';
 const ALGORITHM_CHECKBOX = 'algorithm';
-const MARKER_DISTINCT_CHARACTERS = 4;
-const MESSAGE_DISTINCT_CHARACTERS = 14;
+const CHARCODE_START=64;
+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';

 /**
 * Main function
 */
 window.onload = function() {
-  document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
-  document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer);
+    document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
+    document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer);
 }

 /**
@@ -20,8 +22,8 @@ window.onload = function() {
 function calculateAnswer(event) {
  console.info("Calculating answer for input...");
  let assignment = document.getElementById(ASSIGNMENT).value;
-  let distinctCharacters = (document.getElementById(ALGORITHM_CHECKBOX).checked)? MESSAGE_DISTINCT_CHARACTERS: MARKER_DISTINCT_CHARACTERS;
-  let answer = algorithm(assignment, distinctCharacters);
+  let byCompartiments = document.getElementById(ALGORITHM_CHECKBOX).checked;
+  let answer = algorithm(assignment, byCompartiments);

  document.getElementById(ANSWER).innerText = answer;
 }
@@ -31,28 +33,121 @@ function calculateAnswer(event) {
 * @param assignment the input from the assignment.
 * @return string the answer
 */
-function algorithm(assignment, distinctCharacters) {
-    let signal = assignment.trim();
-    let marker = assignment.substring(0,distinctCharacters);
+function algorithm(assignment, byCompartiments) {
+    let priorityScoreSum = 0;
+    let lines = assignment.trim().split(NEWLINE_CHARACTER);
+    console.info("Linecount:" + lines.length);

-    for(let i=distinctCharacters; i<signal.length; i++) {
-      if(containsDistinctCharacters(marker)) {
-        console.debug("Found marker after:" + i + " characters");
-        return "Marker found after processing: " + i + " characters.";
-      }
+    let increment = (byCompartiments)? 1:3;
+    for(let i=0; i<lines.length; i+=increment) {
+        let inputs = [];
+        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.
- * @param String string the string to check
- * @return true, if string contains only distinct characters
+ * Calculate the answer to assignment.
+ * @param assignment the input from the assignment.
+ * @return string the answer
 */
-function containsDistinctCharacters(string) {
-  console.debug("Check marker: " + string);
-  return new Set(string).size == string.length;
+ function algorithm1(assignment) {
+    let priorityScoreSum = 0;
+    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;
 }