Solution for assignment3.

README.md

@@ -1,9 +1,12 @@
-# Advent of Code 2022 - Assignment 4 - javascript
-## Description
-The problem for assignment4 deals with overlaps and string parsing. The provided solution for this argument uses substring to parse ranges from file. Furthermore it has a checkbox to trigger whether ranges should fully overlap.
+# 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://www.w3schools.com/jsref/jsref_indexof.asp
-- https://www.geeksforgeeks.org/convert-a-string-to-an-integer-in-javascript/#:~:text=In%20JavaScript%20parseInt()%20function,argument%20of%20parseInt()%20function.
-- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring
-- https://medium.com/@raihan_tazdid/overlapping-numbers-in-ranges-5d0f2efc294e
+- 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

index.html

@@ -9,7 +9,7 @@
     <p>Assignment:</p>
     <textarea rows="15" cols="50" id="assignment"></textarea>
     <input type="checkbox" id="algorithm"/>
-    <label for="algorithm">Full overlap</label> 
+    <label for="algorithm">Solution by compartiment.</label> 
 
     <p>Answer:</p>
     <div id="answer">Provide input first</div>

script.js

@@ -1,10 +1,11 @@
 const ASSIGNMENT = 'assignment';
 const ANSWER = 'answer';
 const ALGORITHM_CHECKBOX = 'algorithm';
-const ERROR_MESSAGE_INVALID_RANGE = "Invalid range, ";
-const COMMA_CHARACTER = ',';
+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';
-const RANGE_CHARACTER = '-';
 
 /**
  * Main function
@@ -21,8 +22,8 @@ window.onload = function() {
 function calculateAnswer(event) {
   console.info("Calculating answer for input...");
   let assignment = document.getElementById(ASSIGNMENT).value;
-  let fullOverlap = document.getElementById(ALGORITHM_CHECKBOX).checked;
-  let answer = algorithm(assignment, fullOverlap);
+  let byCompartiments = document.getElementById(ALGORITHM_CHECKBOX).checked;
+  let answer = algorithm(assignment, byCompartiments);
 
   document.getElementById(ANSWER).innerText = answer;
 }
@@ -30,73 +31,123 @@ function calculateAnswer(event) {
 /**
  * Calculate the answer to assignment.
  * @param assignment the input from the assignment.
- * @param fullOverlap if input needs to fully overlap.
  * @return string the answer
  */
-function algorithm(assignment, fullOverlap) {
+function algorithm(assignment, byCompartiments) {
+    let priorityScoreSum = 0;
     let lines = assignment.trim().split(NEWLINE_CHARACTER);
     console.info("Linecount:" + lines.length);
 
-    let containedPairs = 0;
-    for(let i=0; i<lines.length; i++) {
-        let error = false;
-        let ranges = lines[i].trim();
-        // Search for separation charactes -,-
-        let range1CharacterIndex = ranges.indexOf(RANGE_CHARACTER);
-        let range1EndCharacterIndex = ranges.indexOf(COMMA_CHARACTER);
-        let range2CharacterIndex = ranges.indexOf(RANGE_CHARACTER, range1CharacterIndex+1);
+    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
 
-        // Get range substrings
-        let range1LowerString = ranges.substring(0,range1CharacterIndex);
-        let range1HigherString = ranges.substring(range1CharacterIndex+1, range1EndCharacterIndex);
-        let range2LowerString = ranges.substring(range1EndCharacterIndex+1, range2CharacterIndex);
-        let range2HigherString = ranges.substring(range2CharacterIndex+1);
-        console.debug("Parsed values: " + range1LowerString + "-" + range1HigherString + "," + range2LowerString + "-" + range2HigherString);
-
-        // Parse to int
-        let range1Lower = parseInt(range1LowerString);
-        let range1Higher = parseInt(range1HigherString);
-        let range2Lower = parseInt(range2LowerString);
-        let range2Higher = parseInt(range2HigherString);
-
-        // Validation
-        if(range1Lower > range1Higher) {
-            console.error(ERROR_MESSAGE_INVALID_RANGE + range1Lower + "-" + range1Higher + " on line:" + i + " for range1");
-            error = true;
-        }
-        if(range2Lower > range2Higher) {
-            console.error(ERROR_MESSAGE_INVALID_RANGE + range2Lower + "-" + range2Higher + " on line:" + i + " for range2");
-            error = true;
+        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, '')];
         }
 
-        if(error) {
+        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;
+    }
 
-        // Check for overlap
-        if(fullOverlap && doesRangeFullyOverlap(range1Lower, range1Higher, range2Lower, range2Higher) 
-            || !fullOverlap && doesRangeOverlap(range1Lower, range1Higher, range2Lower, range2Higher)) {
-            console.debug("Found overlapping range:" + range1Lower + "-" + range1Higher + "," + range2Lower + "-" + range2Higher);
-            containedPairs++;
+    return "SUM priorityscore: " + priorityScoreSum;
+}
+
+/**
+ * Calculate the answer to assignment.
+ * @param assignment the input from the assignment.
+ * @return string the answer
+ */
+ 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 "Fully overlapping timeslot counts: " + containedPairs;
+    return "SUM priorityscore: " + priorityScoreSum;
 }
 
-function doesRangeFullyOverlap(lower, higher, lower2, higher2) {
-    console.debug("Compare range: " + lower + "-" + higher + " with " + lower2 + "-" + higher2);
-    if(lower > higher || lower2 > higher2) {
-        return false;
-    } 
-    return ((lower <= lower2 && higher >= higher2) || (lower2 <= lower && higher2 >= higher));
+/**
+ * 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;
+        }
+    }
 }
 
-function doesRangeOverlap(lower, higher, lower2, higher2) {
-    console.debug("Compare range: " + lower + "-" + higher + " with " + lower2 + "-" + higher2);
-    if(lower > higher || lower2 > higher2) {
-        return false;
-    } 
+/**
+ * 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;
+    }
 
-    return higher2 >= lower && lower2 <= higher;
+    result += character.charCodeAt() - CHARCODE_START;
+
+    return result;
 }

style.css

@@ -9,7 +9,7 @@ body {
   textarea {
     display: block;
   }
-
+  
   #answer {
     color: purple
   }