Solution for assignment4.

README.md

@@ -1,13 +1,9 @@
-# Advent of Code 2022 - Assignment5 javascript
-This repository contains answers to the assignments of Advent of Coding 2022
+# 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.
 
 ## References
-- https://www.w3schools.com/jsref/jsref_includes.asp
-- https://stackoverflow.com/questions/10261986/how-to-detect-string-which-contains-only-spaces
 - https://www.w3schools.com/jsref/jsref_indexof.asp
-- https://stackoverflow.com/questions/8073673/how-can-i-add-new-array-elements-at-the-beginning-of-an-array-in-javascript
-- https://stackoverflow.com/questions/966225/how-can-i-create-a-two-dimensional-array-in-javascript
-- https://www.w3schools.com/jsref/jsref_ceil.asp
-- https://stackoverflow.com/questions/30561056/console-log-a-multi-dimensional-array
-- https://teamtreehouse.com/community/removing-more-than-1-element-using-pop-and-shift-method
-- https://stackoverflow.com/questions/14723848/push-multiple-elements-to-array
+- 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

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">All containers at once?</label>
+    <label for="algorithm">Full overlap</label> 
 
     <p>Answer:</p>
     <div id="answer">Provide input first</div>

script.js

@@ -1,11 +1,10 @@
 const ASSIGNMENT = 'assignment';
 const ANSWER = 'answer';
 const ALGORITHM_CHECKBOX = 'algorithm';
-const CONTAINER_NULL_CHARACTER=0;
-const INSTRUCTION_FROM='from';
-const INSTRUCTION_MOVE='move';
-const INSTRUCTION_TO='to';
+const ERROR_MESSAGE_INVALID_RANGE = "Invalid range, ";
+const COMMA_CHARACTER = ',';
 const NEWLINE_CHARACTER = '\n';
+const RANGE_CHARACTER = '-';
 
 /**
  * Main function
@@ -22,8 +21,8 @@ window.onload = function() {
 function calculateAnswer(event) {
   console.info("Calculating answer for input...");
   let assignment = document.getElementById(ASSIGNMENT).value;
-  let allAtOnce = document.getElementById(ALGORITHM_CHECKBOX).checked;
-  let answer = algorithm(assignment, allAtOnce);
+  let fullOverlap = document.getElementById(ALGORITHM_CHECKBOX).checked;
+  let answer = algorithm(assignment, fullOverlap);
 
   document.getElementById(ANSWER).innerText = answer;
 }
@@ -31,137 +30,73 @@ function calculateAnswer(event) {
 /**
  * Calculate the answer to assignment.
  * @param assignment the input from the assignment.
- * @param allAtOnce should all containers be moved at once.
+ * @param fullOverlap if input needs to fully overlap.
  * @return string the answer
  */
-function algorithm(assignment, allAtOnce) {
-    let lines = assignment.split(NEWLINE_CHARACTER);
-    let containerPlan = Array.from({length:(lines[0].length+1)/4}, () => [])
+function algorithm(assignment, fullOverlap) {
+    let lines = assignment.trim().split(NEWLINE_CHARACTER);
     console.info("Linecount:" + lines.length);
 
-    let parsec = true;
+    let containedPairs = 0;
     for(let i=0; i<lines.length; i++) {
-        if(parsec) {
+        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);
 
-            // Parse containers
-            let containerLine = lines[i];
+        // 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);
 
-            // Skip numbers
-            if(containerLine[1] == '1') {
-                parsec = false;
-                i+=1;
-                console.table(containerPlan);
-                continue;
-            }
+        // Parse to int
+        let range1Lower = parseInt(range1LowerString);
+        let range1Higher = parseInt(range1HigherString);
+        let range2Lower = parseInt(range2LowerString);
+        let range2Higher = parseInt(range2HigherString);
 
-            let containers = parseContainers(containerLine);
-            if(containers == -1) {
-                // invalid containerline
-                // TODO: error
-                console.error("Container parse failure.");
-                continue;
-            }
+        // 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;
+        }
 
-            // Add containers
-            //console.debug(containers);
-            for(let j=0; j<containers.length; j++) {
-                let container = containers[j];
-                //console.debug(container);
-                if(container != CONTAINER_NULL_CHARACTER) {
-                    //console.debug(j);
-                    //console.debug(containerPlan);
-                    containerPlan[j].push(container);
-                }
-            }
-            //console.table(containerPlan);
-        } else {
-            // Parse instructions
-            let instructionLine = lines[i];
-            let instruction = parseInstruction(instructionLine);
+        if(error) {
+            continue;
+        }
 
-            console.debug(instruction);
-            if(instruction == -1) {
-                // invalid instructionline
-                // TODO: error
-                console.error("Instruction parse failure.");
-                continue;
-            }
-
-            // Execute instruction
-            let movecount=0;
-            if(allAtOnce) {
-                while(instruction.move > 0) {
-                    let container = containerPlan[instruction.from].shift();
-                    containerPlan[instruction.to].unshift(container);
-                    instruction.move--;
-                    movecount++;
-                }
-                console.debug("moved:" + movecount);
-            } else {
-                let splicedContainers = containerPlan[instruction.from].splice(0, instruction.move);
-                containerPlan[instruction.to].unshift(...splicedContainers);
-            }
-
-            //console.table(containerPlan);
+        // 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++;
         }
     }
 
-    let result="";
-    for(let k=0; k<containerPlan.length; k++) {
-        result += containerPlan[k][0];
-    }
-
-    return "Top containers on the stack are: " + result;
+    return "Fully overlapping timeslot counts: " + containedPairs;
 }
 
-function parseInstruction(instructionLine) {
-    let instruction={
-        move:0,
-        from:0,
-        to:0,
-    }
-
-    instructionLine.replace(/\s/g, ''); // Remove whitespace
-    let fromIndex = instructionLine.indexOf(INSTRUCTION_FROM);
-    let moveIndex = instructionLine.indexOf(INSTRUCTION_MOVE);
-    let toIndex = instructionLine.indexOf(INSTRUCTION_TO);
-
-    // Validate
-    if(fromIndex < 0 || moveIndex < 0 || toIndex < 0) {
-        // Error
-        return -1;
-    }
-
-    // TODO validate check for numbers after indices.
-
-    // Parse
-    instruction.move = parseInt(instructionLine.substring(moveIndex + INSTRUCTION_MOVE.length + 1, fromIndex));
-    instruction.from = parseInt(instructionLine.substring(fromIndex + INSTRUCTION_FROM.length + 1, toIndex)) -1;
-    instruction.to = parseInt(instructionLine.substring(toIndex + INSTRUCTION_TO.length + 1)) -1;
-
-    return instruction;
+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));
 }
 
-function parseContainers(containerLine) {
-    let containerLineLength = (containerLine.length+1);
-    //console.debug("Parse ContainerLine, length: " + containerLineLength);
+function doesRangeOverlap(lower, higher, lower2, higher2) {
+    console.debug("Compare range: " + lower + "-" + higher + " with " + lower2 + "-" + higher2);
+    if(lower > higher || lower2 > higher2) {
+        return false;
+    } 
 
-    if(!containerLine.includes('[') || !containerLine.includes(']') || containerLineLength % 4 != 0) {
-        return -1;
-    }
-
-    let containers = [];
-    for(let i=0; i<containerLineLength; i+=4) {
-        let containerLineSubString = containerLine.substring(i, i+4).trim();
-        let character = containerLineSubString[1];
-        if(containerLineSubString[0] != '[' || containerLineSubString[2] != ']') {
-                // Warning invalid container format
-                // TODO: warning
-        }
-
-        containers.push((!character)? CONTAINER_NULL_CHARACTER: character);
-    }
-    //console.debug(containers);
-
-    return containers;
+    return higher2 >= lower && lower2 <= higher;
 }

style.css

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