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assignment
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README.md
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README.md
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# Advent of Code 2022 - Assignment8 javascript
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## Description
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This problem is all about walking through a grid. In this solution, we look through an entire column and row until we find a node with height <= height.
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# Advent of Code 2022 - assignment 1
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This is the first assignment for Advent of Code 2022. The provided solution uses 3 variables: currentScore, highestCalorieScore, currentElf, highestElf.
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It is complexity O(n+m) since it loops through every line exactly once (n) and the iterates for recalculating highscore (m).
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The GUI also provides a checkbox to toggle top3 or top1.
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## References
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- https://www.w3schools.com/jsref/jsref_charat.asp
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- https://stackabuse.com/javascript-check-if-variable-is-a-number/
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- https://www.w3schools.com/jsref/jsref_abs.asp
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## Solution description
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Every iteration the score is added to the currentScore. If an empty line is detected we check if currentscore exceeds one of our highestCalorieScore, if yes we assign currentElf to highestElf.
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## references
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- https://adventofcode.com/2022/day/1
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- https://stackoverflow.com/questions/17595361/how-to-read-text-line-by-line-in-a-html-text-area
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- https://bobbyhadz.com/blog/javascript-get-value-of-textarea
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- https://stackoverflow.com/questions/154059/how-do-i-check-for-an-empty-undefined-null-string-in-javascript
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- https://www.geeksforgeeks.org/convert-a-string-to-an-integer-in-javascript/#:~:text=In%20JavaScript%20parseInt()%20function,argument%20of%20parseInt()%20function.
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- https://stackoverflow.com/questions/1230233/how-to-find-the-sum-of-an-array-of-numbers
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- https://www.w3schools.com/js/js_break.asp
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- https://2ality.com/2018/12/creating-arrays.html
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@@ -8,8 +8,8 @@
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<body>
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<p>Assignment:</p>
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<textarea rows="15" cols="50" id="assignment"></textarea>
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<input type="checkbox" id="algorithm" />
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<label for="algorithm">Highest scenic score?</label>
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<input type="checkbox" id="algorithm"/>
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<label for="algorithm">TOP 3</label>
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<p>Answer:</p>
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<div id="answer">Provide input first</div>
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138
script.js
138
script.js
@@ -2,13 +2,15 @@ const ASSIGNMENT = 'assignment';
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const ANSWER = 'answer';
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const ALGORITHM_CHECKBOX = 'algorithm';
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const NEWLINE_CHARACTER = '\n';
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const TOP_1 = 1;
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const TOP_N = 3;
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/**
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* Main function
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*/
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window.onload = function () {
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document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
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document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer);
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window.onload = function() {
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document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
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document.getElementById(ALGORITHM_CHECKBOX).addEventListener("click", calculateAnswer);
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}
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/**
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@@ -18,117 +20,51 @@ window.onload = function () {
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function calculateAnswer(event) {
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console.info("Calculating answer for input...");
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let assignment = document.getElementById(ASSIGNMENT).value;
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let getHighestScenicScore = document.getElementById(ALGORITHM_CHECKBOX).checked;
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let answer = algorithm(assignment, getHighestScenicScore);
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let top3 = document.getElementById(ALGORITHM_CHECKBOX).checked;
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let answer = algorithm(assignment, (top3)? TOP_N: 1);
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document.getElementById(ANSWER).innerText = answer;
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}
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/**
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* Calculate the answer to assignment.
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* Calculate the answer to assignment1 with 2 variables, count and highest.
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* @param assignment the input from the assignment.
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* @return string the answer
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* @param topn the
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* @return string the elf with the highest calory count
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*/
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function algorithm(assignment, getHighestScenicScore) {
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let lines = assignment.trim().split(NEWLINE_CHARACTER);
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console.info("Linecount:" + lines.length);
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function algorithm(assignment, topn) {
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let currentCalorieScore = 0;
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let highestCalorieScores = Array.from({length: topn}, () => (0));
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let currentElf = 1;
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let visibleTreeCount = 0;
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let highestScenicScore = 0;
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let lines = assignment.trim().split(NEWLINE_CHARACTER);
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console.info("Linecount:" + lines.length);
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for (let i = 0; i < lines.length; i++) {
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let row = lines[i].trim();
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for(var i = 0; i < lines.length; i++){
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let line = lines[i];
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for (let j = 0; j < row.length; j++) {
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if (i <= 0 || i >= lines.length - 1 || j <= 0 || j >= row.length - 1) { // Edge node
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//console.debug("Edge node found.");
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visibleTreeCount++;
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continue;
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}
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if(!line && currentCalorieScore > 0) { // Check for empty line and skip subsequent emptylines
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console.debug("Calculated score for elf " + currentElf + ": " + currentCalorieScore);
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let height = parseInt(lines[i].charAt(j));
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if (!walkRowVisible(height, j, row) && !walkColumnVisible(height, i, j, lines)) {
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console.log("Found invisible tree, height:" + height + ", i:" + i + ", j:" + j);
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visibleTreeCount--;
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}
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for(let j=0; j < highestCalorieScores.length; j++) {
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if(currentCalorieScore > highestCalorieScores[j]) {
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console.debug("New highest #"+(j+1) + " elf found, with score:" + currentCalorieScore);
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let oldHighestCalorieScore = highestCalorieScores[j];
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highestCalorieScores[j] = currentCalorieScore;
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currentCalorieScore = oldHighestCalorieScore;
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}
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}
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if (getHighestScenicScore) {
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let scenicScore = walkRowCount(height, j, row) * walkColumnCount(height, i, j, lines);
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if (scenicScore > highestScenicScore) {
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console.debug("Found new highest scenic score: " + scenicScore);
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highestScenicScore = scenicScore;
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// Reset values
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currentCalorieScore = 0;
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currentElf++;
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continue;
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}
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}
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// Tree is on edge.
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visibleTreeCount++;
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let calorieScore = parseInt(line);
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currentCalorieScore += calorieScore;
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}
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}
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if (getHighestScenicScore) {
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return "Highest scenic score: " + highestScenicScore;
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}
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return "Amount of visible trees in the grid: " + visibleTreeCount;
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}
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function walkColumnCount(height, index, rowIndex, column) {
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return walkCount(height, index, column, false, rowIndex);
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}
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function walkRowCount(height, index, row) {
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return walkCount(height, index, row, true, -1);
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}
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function walkColumnVisible(height, index, rowIndex, column) {
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return walkVisible(height, index, column, false, rowIndex);
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}
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function walkRowVisible(height, index, row) {
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return walkVisible(height, index, row, true, -1);
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}
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function walkCount(height, index, line, isRow, rowIndex) {
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let visibleLeftCount = __walkHelper(height, index, line, isRow, -1, rowIndex, 0);
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let visibleRightCount = __walkHelper(height, index, line, isRow, 1, rowIndex, 0);
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return visibleLeftCount * visibleRightCount;
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}
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function walkVisible(height, index, line, isRow, rowIndex) {
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let visibleLeft = __walkHelper(height, index, line, isRow, -1, rowIndex);
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let visibleRight = __walkHelper(height, index, line, isRow, 1, rowIndex);
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return visibleLeft || visibleRight;
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}
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function __walkHelper(height, index, line, isRow, direction, rowIndex, count) {
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if (direction == 0) {
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console.error("Invalid direction 0 in __walkhelper");
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return -1;
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}
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direction = direction / Math.abs(direction);
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// Edge reached
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if ((direction < 0 && index <= 0) || (direction > 0 && index >= line.length - 1)) {
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return (count == undefined) ? true : count;
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}
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let nextIndex = index + direction;
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let nextHeightCharacter = (isRow) ? line.charAt(nextIndex) : line[nextIndex].trim().charAt(rowIndex);
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let nextHeight = parseInt(nextHeightCharacter);
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if (isNaN(height) || isNaN(nextHeightCharacter)) {
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console.error("Invalid height found, height:" + height + ", nextHeight: " + nextHeightCharacter);
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return -1;
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}
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if (height <= nextHeight) {
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if (count == undefined)
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return false;
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return count + 1;
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}
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return __walkHelper(height, nextIndex, line, isRow, direction, rowIndex, (count !=undefined)? count + 1 : undefined);
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console.debug(highestCalorieScores);
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return "The highest of sum of calorie amount: " + highestCalorieScores.reduce(function(a, b) { return a + b; }, 0);
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}
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Reference in New Issue
Block a user