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2DBussy shad/ban :!marseykneel::marseydeux::marseykneel:  1yr ago (text post) Edited 1yr ago 308 thread views #131258

AoC Day 14 : Sands of time

I won't paste my code yet since my parser just does the needful, and I somehow manage to get overlapping grains of sand, though that doesn't matter in the end.

I'm also seeing a lot of pythonistas having high runtime (1-10s+ and more) and I'm here with the bruteforce grain-by-grain taking 150ms for part 2 (including drawing the final graph lmao). Matlab chads can't stop winning :gigachad2:

EDIT : part 2 webm

16
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little late guys:

type str = string;
type Arr<T> = Array<T>;

class Pnt {
  x: u16; y:u16;
  constructor(x:u16, y:u16) {this.x=x; this.y=y};
  toString():string { return `${this.x},${this.y}`};
};

const AIR: u8 = 0;
const ROCK: u8 = 1;
const SAND: u8 = 2;

let shiftX: u16 = 490;
let sandX: u16 = 500 - shiftX;
let depth: u16 = 13;
let width: u16 = 20;
let grid: u8[][] = [];
let maxY:u16=0, minX:u16=1000, maxX:u16=0;

function setup(input:str):void {
  const strLines: Arr<str> = input.split('\n');
  const pntLines
    = strLines.map<Arr<Pnt>>((l:str) => l.split(' -> ').map<Pnt>(
      (ln:str) => {
        const p = ln.split(',').map((p:str)=>u16.parse(p));
        return new Pnt(p[0],p[1]);
      }
    ));
  // console.log(pntLines.map(
  //   (pln:Arr<Pnt>)=>pln.toString()).join('\n')
  // );
  pntLines.forEach((pln:Arr<Pnt>) => {
    pln.forEach((p:Pnt) => {
      if (p.y > maxY) maxY=p.y;
      if (p.x < minX) minX=p.x;
      if (p.x > maxX) maxX=p.x;
    })
  });

  console.log(`${minX} ${maxX} ${maxY}`);

  depth = maxY+3;
  width = depth*2;
  shiftX = 500 - u16(Math.floor(width/2));
  sandX = 500 - shiftX;
  grid = new Array<u8>(depth).map(
    () => new Array<u8>(width).fill(AIR)
  );

  console.log(`${depth} ${width} ${shiftX} ${sandX}`)

  pntLines.forEach((pln:Arr<Pnt>) => {
    let curPnt:Pnt = pln[0];
    for (let i = 0; i < pln.length; i++) {
      const p:Pnt = pln[i];
      const dx:i16 = i16(curPnt.x) - i16(p.x);
      const dy:i16 = i16(curPnt.y) - i16(p.y);
      // console.log(`---- ${dx} ${dy}`)
      for (let x:u16 = p.x;
        dx<0 ? x>=curPnt.x : x<=curPnt.x;
        dx<0 ? x-- : x++) {
        for (let y:u16 = p.y; 
          dy<0 ? y>=curPnt.y : y<=curPnt.y;
          dy<0 ? y-- : y++) {
          grid[y][x-shiftX] = ROCK;
          // console.log(`${y} ${x-SHIFT_X}`)
        }
      }
      curPnt=p;
    }
  });

  for (let x:u16 = 0; x < width; x++) {
    grid[maxY+2][x] = ROCK;
  }
}

function print(): void {
  console.log(grid.map((row:Arr<u8>) => row.map(
    (c:u8) => c===ROCK?'#' : c===SAND?'o' : '.').join('')
  ).join('\n'));
}

function doOneSand(): boolean {
  let snd = new Pnt(sandX, 0);

  if (grid[0][500-shiftX]) {
    console.log('sand creation blocked');
    return false;
  };

  while (true) {
    if (snd.y > depth-1 || snd.x < 0 || snd.x >= width-1) {
      console.log('abyss reached');
      return false;
    }
    if (!grid[snd.y+1][snd.x]) {
      snd.y = snd.y+1;
    } else if (!grid[snd.y+1][snd.x-1]) {
      snd.y = snd.y+1;
      snd.x = snd.x-1;
    } else if (!grid[snd.y+1][snd.x+1]) {
      snd.y = snd.y+1;
      snd.x = snd.x+1;
    } else {
      break;
    }
  }

  grid[snd.y][snd.x] = SAND;
  return true;
};

export function run(input: str):void {
  setup(input);

  let numSnd: u32 = 0;
  while(doOneSand()) numSnd++;
  console.log(numSnd.toString());

  print();
};

too lazy to remove debug code

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