AoC Day 8

aoc.ts

import * as fs from "fs";

function readFile(path: number) {
  const result =
      fs.readFileSync(`/home/acorn/projects/js/foony/scripts/src/aoc/${path}.txt`, 'utf-8').split('\r\n');
  for (let i = result.length - 1; i >= 0; --i) {
    if (!result[i].trim()) {
      --result.length;  // Last line is empty, remove it
    } else {
      return result;
    }
  }
  return result;
}

function eight() {
  const grid: number[][] = [];  //[y][x]
  function isVisible(x: number, y: number) {
    const height = grid[y][x];
    if (x === 0 || x === grid[y].length - 1 || y === 0 || y === grid.length - 1) {
      return true;
    }
    for (let i = x - 1; i >= 0; --i) {  // left
      if (height <= grid[y][i]) {
        break;
      }
      if (i === 0) {
        return true;
      }
    }
    for (let i = x + 1; i < grid[y].length; ++i) {  // Right
      if (height <= grid[y][i]) {
        break;
      }
      if (i === grid[y].length - 1) {
        return true;
      }
    }
    for (let j = y - 1; j >= 0; --j) {  // Top
      if (height <= grid[j][x]) {
        break;
      }
      if (j === 0) {
        return true;
      }
    }
    for (let j = y + 1; j < grid.length; ++j) {  // Bottom
      if (height <= grid[j][x]) {
        break;
      }
      if (j === grid.length - 1) {
        return true;
      }
    }
    return false;
  }

  function calculateScore(x: number, y: number) {
    const height = grid[y][x];
    let score = 1;
    let multiplier = 0;
    for (let i = x - 1; i >= 0; --i) {  // left
      ++multiplier;
      if (height <= grid[y][i]) {
        break;
      }
    }
    score *= multiplier;
    multiplier = 0;
    for (let i = x + 1; i < grid[y].length; ++i) {  // Right
      ++multiplier;
      if (height <= grid[y][i]) {
        break;
      }
    }
    score *= multiplier;
    multiplier = 0;
    for (let j = y - 1; j >= 0; --j) {  // Top
      ++multiplier;
      if (height <= grid[j][x]) {
        break;
      }
    }
    score *= multiplier;
    multiplier = 0;
    for (let j = y + 1; j < grid.length; ++j) {  // Bottom
      ++multiplier;
      if (height <= grid[j][x]) {
        break;
      }
    }
    score *= multiplier;
    return score;
  }

  for (const line of readFile(8)) {
    if (line) {
      grid.push(line.split('').map(line => +line));
    }
  }

  let maxScore = 0;
  for (let y = 0; y < grid.length; ++y) {
    for (let x = 0; x < grid[y].length; ++x) {
      console.log({x, y, score: calculateScore(x, y)});
      maxScore = Math.max(maxScore, calculateScore(x, y));
    }
  }
  console.log('total score', maxScore);
}
eight();