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userturkey13 sieg/heil  1yr ago (text post) 458 thread views #129718

Advent of Code 2022: Day 8

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would've been easier if i wasn't so damn dyslexic

// build grid
import * as fs from 'fs'
const g: number[][] = [];
fs.readFileSync(process.argv[2], 'utf-8').split('\n')
  .map((l, i) => g[i] = l.split('').map(s => Number(s)));

// PART 1 - O(n)
const v: {[key: string]: 1}= {};
const lft = {r:0, c:0, h:-1};
const rht = {...lft}, top = {...lft}, bot = {...lft};
for (let i = 0; i < g.length; i++) {
  for (let j = 0; j < g.length; j++) {
    lft.r = rht.r = top.c = bot.c = i;
    lft.c =         top.r         = j;
            rht.c         = bot.r = g.length-j-1;
    const check = (dir: typeof lft) => {
      const h = g[dir.r][dir.c];
      if (h > dir.h) {
        v[`${dir.r}-${dir.c}`] = 1;
        dir.h = h;
      }
    };
    check(lft); check(rht); check(top); check(bot);
  }
  lft.h = rht.h = top.h = bot.h = -1;
}
console.log(Object.keys(v).length);

// PART 2 - O(n^2)
const score = (r: number, c: number) => {
  const h = g[r][c];
  let sTop=0, sLft=0, sRht=0, sBot=0;
  for (let iR=r; iR > 0 && ++sTop && (g[iR-1][c] < h); iR--);
  for (let iC=c; iC > 0 && ++sLft && ((g[r][iC-1] < h)); iC--);
  for (let iC=c; (iC < g.length-1) && ++sRht && (g[r][iC+1] < h); iC++);
  for (let iR=r; (iR < g.length-1) && ++sBot && (g[iR+1][c] < h); iR++);
  return sLft * sRht * sTop * sBot;
}
let maxScr = 0;
g.map((row, r) => row.map((_, c) => {
  const scr = score(r, c);
  if (scr > maxScr) maxScr = scr;
}))
console.log(maxScr);

now that i think of it, there's probably a O(n) solution for PART 2, i'm just a bit lazy on figuring it out.

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