Messy initial solution.

2022-12-06 17:03:21 +01:00
3 changed files with 146 additions and 29 deletions
--- a/README.md
+++ b/README.md
@@ -1,5 +1,13 @@
-# Advent of Code 2022 - Assignment6_javascript
+# Advent of Code 2022 - Assignment5 javascript
 This repository contains answers to the assignments of Advent of Coding 2022

 ## References
- https://stackoverflow.com/questions/28207610/checking-if-the-characters-in-a-string-are-all-unique
+- 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
--- 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">All containers at once?</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 CONTAINER_NULL_CHARACTER=0;
+const INSTRUCTION_FROM='from';
+const INSTRUCTION_MOVE='move';
+const INSTRUCTION_TO='to';
 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 allAtOnce = document.getElementById(ALGORITHM_CHECKBOX).checked;
+  let answer = algorithm(assignment, allAtOnce);

  document.getElementById(ANSWER).innerText = answer;
 }
@@ -29,30 +31,137 @@ function calculateAnswer(event) {
 /**
 * Calculate the answer to assignment.
 * @param assignment the input from the assignment.
+ * @param allAtOnce should all containers be moved at once.
 * @return string the answer
 */
-function algorithm(assignment, distinctCharacters) {
-    let signal = assignment.trim();
-    let marker = assignment.substring(0,distinctCharacters);
+function algorithm(assignment, allAtOnce) {
+    let lines = assignment.split(NEWLINE_CHARACTER);
+    let containerPlan = Array.from({length:(lines[0].length+1)/4}, () => [])
+    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 parsec = true;
+    for(let i=0; i<lines.length; i++) {
+        if(parsec) {

-      marker = marker.substring(1, distinctCharacters) + assignment[i];
+            // Parse containers
+            let containerLine = lines[i];
+
+            // Skip numbers
+            if(containerLine[1] == '1') {
+                parsec = false;
+                i+=1;
+                console.table(containerPlan);
+                continue;
+            }
+
+            let containers = parseContainers(containerLine);
+            if(containers == -1) {
+                // invalid containerline
+                // TODO: error
+                console.error("Container parse failure.");
+                continue;
+            }
+
+            // 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);
+
+            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);
+        }
    }

-    return "No marker found.";
+    let result="";
+    for(let k=0; k<containerPlan.length; k++) {
+        result += containerPlan[k][0];
+    }
+
+    return "Top containers on the stack are: " + result;
 }

-/**
- * Check if string only contains distinct characters.
- * @param String string the string to check
- * @return true, if string contains only distinct characters
- */
-function containsDistinctCharacters(string) {
-  console.debug("Check marker: " + string);
-  return new Set(string).size == string.length;
+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 parseContainers(containerLine) {
+    let containerLineLength = (containerLine.length+1);
+    //console.debug("Parse ContainerLine, length: " + containerLineLength);
+
+    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;
 }