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-rw-r--r--2022/17-Pyroclastic-Flow/.eslintrc.json44
-rw-r--r--2022/17-Pyroclastic-Flow/example1
-rw-r--r--2022/17-Pyroclastic-Flow/first.js164
-rw-r--r--2022/17-Pyroclastic-Flow/input1
-rw-r--r--2022/17-Pyroclastic-Flow/package.json8
-rw-r--r--2022/17-Pyroclastic-Flow/second.js213
6 files changed, 431 insertions, 0 deletions
diff --git a/2022/17-Pyroclastic-Flow/.eslintrc.json b/2022/17-Pyroclastic-Flow/.eslintrc.json
new file mode 100644
index 0000000..81e57d1
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/.eslintrc.json
@@ -0,0 +1,44 @@
+{
+ "env": {
+ "es2021": true,
+ "node": true
+ },
+ "extends": [
+ "eslint:recommended",
+ "plugin:node/recommended"
+ ],
+ "overrides": [
+ {
+ "files": ["*.js"],
+ "rules": {
+ "no-constant-condition": "off"
+ }
+ }
+ ],
+ "parserOptions": {
+ "ecmaVersion": "latest",
+ "sourceType": "module"
+ },
+ "rules": {
+ "indent": [
+ "error",
+ "tab"
+ ],
+ "linebreak-style": [
+ "error",
+ "unix"
+ ],
+ "quotes": [
+ "error",
+ "double"
+ ],
+ "semi": [
+ "error",
+ "always"
+ ],
+ "node/no-unsupported-features/es-syntax": [
+ "error",
+ { "ignores": ["modules"] }
+ ]
+ }
+}
diff --git a/2022/17-Pyroclastic-Flow/example b/2022/17-Pyroclastic-Flow/example
new file mode 100644
index 0000000..97a1aa1
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/example
@@ -0,0 +1 @@
+>>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>
diff --git a/2022/17-Pyroclastic-Flow/first.js b/2022/17-Pyroclastic-Flow/first.js
new file mode 100644
index 0000000..f39e853
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/first.js
@@ -0,0 +1,164 @@
+import * as fs from "fs";
+
+function load(filename) {
+ let data = fs.readFileSync(filename, "utf8").trim();
+ const l = data.length;
+ let i = 0;
+ return {
+ next: function () {
+ const c = data[i];
+ i = (i + 1) % l;
+ return c;
+ }
+ };
+}
+
+const shapes = [
+ [0b0011110],
+ [0b0001000, 0b0011100, 0b0001000],
+ [0b0000100, 0b0000100, 0b0011100],
+ [0b0010000, 0b0010000, 0b0010000, 0b0010000],
+ [0b0011000, 0b0011000],
+];
+const shapes_len = shapes.length;
+
+class Shape {
+ constructor(shape) {
+ this.shape = shape;
+ this.length = shape.length;
+ }
+ fall(field) { // returns true if the shape fell without colliding
+ for (let i=0; i<this.length; ++i) {
+ const next = field.get(i+1);
+ if (next === undefined || next & this.shape[i]) { //collision
+ field.solidify(this.shape);
+ return false;
+ }
+ }
+ field.fall();
+ return true;
+ }
+ shift(field, direction) {
+ let collision = false;
+ let tmp;
+ switch(direction) {
+ case ">":
+ tmp = this.shape.map(line => {
+ if (line & 0b1) { // we touch the right edge already
+ collision = true;
+ }
+ return line >>> 1;
+ });
+ break;
+ case "<":
+ tmp = this.shape.map(line => {
+ if (line & 0b1000000) { // we touch the left edge already
+ collision = true;
+ }
+ return line << 1;
+ });
+ break;
+ default:
+ throw "invalid direction character in shape shift: " + direction;
+ }
+ if (collision) {
+ return;
+ }
+ for (let i=0; i<this.length; ++i) {
+ if (field.get(i) & tmp[i]) { //collision
+ return;
+ }
+ }
+ this.shape = tmp;
+ }
+ print() {
+ this.shape.forEach(line => {
+ console.log(
+ line & 0b1000000 ? "#" : ".",
+ line & 0b0100000 ? "#" : ".",
+ line & 0b0010000 ? "#" : ".",
+ line & 0b0001000 ? "#" : ".",
+ line & 0b0000100 ? "#" : ".",
+ line & 0b0000010 ? "#" : ".",
+ line & 0b0000001 ? "#" : ".",
+ );
+ });
+ console.log("=======");
+ }
+}
+class Shaper {
+ constructor() {
+ this.index = 0;
+ }
+ next(field) {
+ const s = new Shape(shapes[this.index]);
+ field.accomodate(shapes[this.index].length + 3);
+ this.index = (this.index + 1) % shapes_len;
+ return s;
+ }
+}
+class Field {
+ constructor() {
+ this.data = [];
+ this.offset = 0;
+ }
+ accomodate(n) {
+ this.offset = 0;
+ for(let i=0; i<n; ++i) {
+ this.data.unshift(0);
+ }
+ }
+ fall() {
+ if (this.data[0] !== 0) { // we need to fall bellow the top line?
+ this.offset++;
+ } else {
+ this.data.shift();
+ }
+ }
+ get(offset) {
+ return this.data[this.offset + offset];
+ }
+ print() {
+ this.data.forEach(line => {
+ console.log(
+ line & 0b1000000 ? "#" : ".",
+ line & 0b0100000 ? "#" : ".",
+ line & 0b0010000 ? "#" : ".",
+ line & 0b0001000 ? "#" : ".",
+ line & 0b0000100 ? "#" : ".",
+ line & 0b0000010 ? "#" : ".",
+ line & 0b0000001 ? "#" : ".",
+ );
+ });
+ console.log("-------");
+ }
+ solidify(shape) {
+ for(let i=0; i<shape.length; ++i) {
+ this.data[i+this.offset] |= shape[i];
+ }
+ }
+}
+
+let example = load("example");
+let input = load("input");
+
+function solve(input) {
+ let field = new Field();
+ let shaper = new Shaper();
+ for(let i=0; i<2022; ++i) {
+ let shape = shaper.next(field);
+ do {
+ shape.shift(field, input.next());
+ } while(shape.fall(field));
+ }
+ field.print();
+ return field.data.length;
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 3068) {
+ console.log("Example failed with height " + exampleOutput);
+ process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));
diff --git a/2022/17-Pyroclastic-Flow/input b/2022/17-Pyroclastic-Flow/input
new file mode 100644
index 0000000..11e769d
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/input
@@ -0,0 +1 @@
+>>>><<><<<<><<<>>><<<>><>>>><<<>>>><<>>><<<<>>><<<<>><>>><<<<><<<<>>>><<>>><<><<><<<>><>>><<>><<<<>><>>><>>><<<<>>>><<>>><<<>><>>>><<<<>>><<>>><<>>>><<<>>>><<<><>>><<<<>>><>>>><<<>>>><<>>><<<<>><<>><<>>><>>>><<<<>>>><<<<>>>><<><<<>>>><<<>>><>><<<><<>><>>>><<>>>><<>>>><<<>>>><<<<><<<<>>>><>>>><<<>>>><<<><<<<>>><<>><<<>>><<>><<<<>>><>>><>>><<<><><<<<>>>><<>>><<<>>>><<<<>>>><<><<>>><>>><<><>>><<<<>>><<<<>>>><<<<>>><<>><<<<>>>><>><<<>>>><<<<>>><><<><>>>><<<<>>><>>>><<<>>>><<<>>>><<>>><<<<>><<>>>><<<<><<<><<<>>>><<<>>>><>><>>>><<<<>>>><><<>>>><<<>>><<<><>>><<>>><>><<<<>>>><<<><<><<>><>><<>>>><<<>>><<<<>>><<<>>><<>>>><<<><<<>>>><>>><><><<<<>>><<><<<>>>><<<<>>>><<<>>>><><<<<>><<<<>>><<<>><<<><>>><<<<>><<<><<<>>>><<>>><<><<<>>><>><<>>><>>>><<<><<><<<>><<<<>><>>>><<><<<<>>>><<>><<>>>><<<>><<<>>>><<<>><<<>><<<<><>>>><<>>><<<>>>><<<<>>><<>>>><<<<>>><<<<>>><<<<>>><<>>><<<<>>>><><<<<>>><<<>>><<>><<<<>>>><<>><><<<>>><<<<>>>><<<>>>><<<>>>><<<>>><><<<<>>><<<>>><<<<>><><<>>>><<<>><<<>>>><<<>>><<<><<<<>>><<<>>>><>>>><><>>>><>><<<<>>>><><<<<>>>><<>>><<<<>>>><>>>><<<<>><<<>>>><<<<><<><><>><>><<<<><<<>><>><<>><<>><<<>>>><<<>><<<><<<<>>><<<<>>><<<<>>><<<>>><<<<>>><<<><<<>><>>><<<<><<<>>>><<>>>><<<<>><>>><<<<>>>><<>><<<><<<<>><<<<>>>><<<>>>><>><<<>>><<<><>>>><<<>><><<<<><<<><<<<>>>><><<>>><<>><<><<<>><<<<>>>><<<<><<<><<<<><<<<>><<<<>>><<<>>><>><<<<>>>><<<<><<<<><<<<>><>><<<<>>>><<<<>>>><<<<>><<<<>>>><><>><<<>>>><<><<><>>><<<>>>><<<<>>>><>>>><>><<<<>><<<>>>><<<><<<<>>>><><<<<>>><<<<>>><<<><><<<>><<<<><<<>>><<<<><<<>>><<<<><<<>>><>>><<>><>>><><>><<><>>><<>>><<<<>>>><<>>>><>>><>><>>>><<<><>>>><<<><<<>>><<<><<<>>><<>>>><<<<>>><>><<<<>>>><<<>>><><<<>>><<>>><><<<<><<>><<<>><<<<>>><<<><<>>><<>>>><<<<>>><<<><<>><<<<>>>><>>>><<<>>><<>><<<<>>><<>>><<<>>><<<<>>>><<>><<>><<<>><><<>><<<><<<>>><<<>><<<<><<><<>>>><<<<>>><><<<><<<<>><<<>>><<>>><>>>><>><>>><<<>>>><<><<>><>><<<>>>><<>>>><>>><<<<>>><<<<>>><<<>><<<<>>><<<>>>><>><<>><><<<<><<>><<>><<<>><<>>>><<><<>>><><><<<<>>><>>><<<>><<<<><<<<>>>><>><<<<>>>><>>><<>>><>>>><<<<><><<<<>>>><>>>><<>>><<><<<>><<<><<>>><<<<><<<>><<><<<>><<>>><<<<><>>>><>><<<<>><<<>><<><<><<<<>>>><><>><>><<<><<<<>>><<<<><<>>>><<<<>>>><<>>>><<>><<>><>><<<<>>>><<<<>>><<<><<<>>><<><<<<>>>><<<>>>><<<<>>>><<<>>><>><<<<>><><<<<>>>><<>>>><<<><<<>>><><>><<<><<<>>><<><<<>><<<<>>><><<<>>>><><><<>>><<<>><>>><<><<<>><><<>>><<<<>>><<>><<<>>><>><><<><<<<><<<<>>><<>>>><<<>><>><<<<>><<>>>><<>>>><<<>>><<<<><><<<<>>>><>>>><>>>><>><<>>>><>>>><<<>>>><<<><<<><<>>><>><>>><>>>><<>>><<<><>><<<<>><<<<><><<<><<>><<<<>>><<<<><<<<>>><<>>><<<<>><>>>><>><<<<>>><><<<<><<>><<<<><<>>><<<>><<<<>>><<<>><<<><<>><<<<>>><<><><<<>>><<<<>>><<<>>><<<><<>><>>><<<>>><<<>><<><<<>>><<<<>><<<><<<<>><>><<>><><>>><<<>>>><<<>>><<<>><>>><><<>>>><<<<><<<>>><<<>>>><<>>><<<>><<<<>>>><<<>>>><>>>><<<<>>>><<<<>><<>><>><<>>><<>>><<>>><<<<><>>>><<<<>>><>>>><<<<>>><<<<>>><<<>><<<>>>><<>>>><<<>>><>>><<<<><<<>>><<<<>><<>>>><>>>><<<<>>>><<<<>><<<<><>>>><<>><<<>>><<<<>>><<><><<>><<>><<<>>><<>>><<<<>>><<<>>>><>><<<>>>><<<>>>><<<>>><>>>><<<>><>><<<<>><>>><<<<>><<>>><<<>><<>>>><<<<>>><<>>><<<><<<>>>><<><<><>>><<<><<>>><<<>>><>>>><<>>>><<<<>>>><<>><<<>>><<>>><<<>><<<>><<>>><<<>>><<<>>>><<<>>><>><<>>><<>><<>>>><><<<><<><<<>>><<<<>>><<<<>><<<<>><<><<<>>>><<<>>>><<<>><<<>><<>>><<<>>><<<<>>>><<<>><<>>>><>>>><<<>><<<<>>>><<<<><<<<>><<>><<<<>>>><<<>>><<<>><>>><>>>><<<<>><<<<>>><<<><<<<>>>><><>><<>><<<<>>>><<>>><<<>>><<>>><<<><<<>>><<>><<<>>>><<>>>><>><>>><<<<>>><<>>><<<><>>><<<>>>><<<>>><><<><<<>><<<><><<>>>><<<>><<<<>>><<<><>><>>>><>>><<>>>><>>><<<<>>><<<>>><<>>><>><<><>><<<>>><<<>><<<><<>><<<><<><<<<><>><<<><<><<<>>>><>>><<<<>>>><<<>>><<><<>><<<<>><>>><>>><<>>><<<<>>><<<<>>>><<<>><<>><<<<>><<<><<<>>><<>>><>><>>>><<><<<>>><<>><<<<>>><>>><<<<>><<<><<>>><<<<><<>><><<<>><><<<>>>><<<><<>>><>>><<<><>>><<<>>><<<<>>><<<<>><>><<>>><<<>>>><<<><<><<<>><<<<>>>><<<>>><<<<>>><<>>>><<<<>>><<<<><<<>><<><<>><<<<>>><<<>>>><<<<>>>><<<><<<<><<>><<<><<<<>><>>><<>><<><>>>><>><<<<>>><<<<><<<<>>><<>>><<>><<<<><<<>>><>>>><<<>><<<>><<<<><<<>>><><<>><<<<>><<<<>>>><<<<>><<<<>>><>><<<>>>><>>>><<<>>>><<>>><<<<>>><>>>><<>>><<<>>><<<>><>>>><<<<>><>>><<<>>>><<>>>><<<<>>><<<<><>>>><>>><>>><<<>><<<>><<<>>>><>>>><<>>>><<<<>>>><<<>>><<<>><>>><<<<>>>><<>>>><>>><<<>>><<>>>><<<<>>>><<<<><<<><<>>>><<<><<>>><<<<>><<<>>>><<<>><<>>><<<<><<<>>>><<<<><<<<>><>><<<>>>><><>>><<<>>><<<>>><><>>>><>>><<>>>><<<<>>>><<>>>><>>><<><>>>><<>><<>>><<<<>>><<<>><<<<>>><><<<<>><<<<>>><>><<<<>>><<<><<<<><><<<<>>><<><>><<<<>>><>>>><><<>>>><<<><>>>><>>>><<<>>><<<<>>>><<>><<><<<<><<<<>><>>>><<<<>>>><<<>>>><>>><<<>><<<>><<<>>>><<<>>>><<<>>>><<<<>><>>>><<>>><>><>>><<<<>>><<>>>><<<<><>>>><<<<>>>><<<<>>>><<<<>>>><<<>><<<<><<<>>><<>>><<>><>>><><<>><<><<<<>>><>><>>><<<<>>>><>><<<>>><>>>><<<><<<<><<<<>><>><<>><<<><<<<><<<>>><><>>><<>>>><<>><<<>>><>><<<>><><<<>>><<<<><<>><<><<<><<<>>><>>><>><<<<>>><><<<<>>>><<<<>><<<<>>><<<><<<<>><<<<><<>>><<<<><>>>><>><<<<><>><>>><<<>><<><<>><>>>><<<>>><<>>>><<<<>>>><>>>><<<><>>><<>><<<<>>><<<><<<<>>>><<<<>>><><<<>><<>><<<>><>>><<>><><>>>><>>><<<>>><<>>><<>>>><>><<<>>><>>><<<>><><<<>>><><<><><><<<<>>><<<>>><<<<>>>><<>><<>>><<<<>>><<<><<<>>><<<><<><<<><<<<><<><><<<<>><<<<>>><<<>><<<<>>><<<>>>><<>><<<><><<>>>><<>>>><><<>>>><<<><<<>>>><<<>>><>>><<<<>>><<<>><>>>><<><<<><>>>><<<<><<<<>>><>><<>>>><<<><>>>><<<><<>>>><<<<>>><>>><<<<>><<<>>>><>>><<<<>>><<>><<<>>>><<<<>>><<><<<<>>>><<>>>><<>>>><<<<>><<<<>><<>>><<>>>><>><<<>>>><>>>><<<<>>><<<<><<<<><<>><<>>>><>><<><<<<>>><<<<>>>><<<>>>><>><<<<>>><<>>><<<>><<<<>><<><<<>>><<<<>>>><<<<><<>><<><<>><<<>><<<<>>>><<<<><>>>><>>>><<<<>>><<>>><<>><<><<<>>><<<<>>>><<<><>>>><<<><<<>>>><<<><<<><<<<>>><<<<><<<<><<>>><<>><<>>>><>><<<<>>>><<<<>>><>>><<<>><<<<><<<>>>><<<>><<><<>><<<<><<><>>><<<<>>><>>><<>>><<<<>><<<<>><>>>><<><<>><>><<<<><<>>>><><<<><<<><>>><<<>><<<>>>><><<>>>><<<><>>><<<><>>>><<<<>><<<>>><<<><<>><<<>>><<>><<<>>>><<<>>>><>>>><<><><<><>><<><<>>><<><>>><>>><>>>><<>><<>>>><<<>>><<>><>>><>><<<<><<>>>><<<>>>><>>><<<>><>>>><<<<><<<>><>>><<<>>><<<<>><<<<><<><<<<><<<><<><<<>><<<<>>>><>>>><<<<>><<>>>><<><><<<>>><<<>>><<>><<<<><<>>><<<><><<>>><<<><<><<<>><<>><<>>>><>><<<<>>><<<<>>>><>><<<<><<<>>>><<<><<<>><<>>>><>><<<<>><<<<>>><<<>>>><<<>>><<<>>>><>>>><><<>>><<>>>><<<<>>><>>>><>>>><<<<>>>><>><<<<>><<>><<<><<>>><<<>>>><<<<>><<>>><<<<>>><<<>><<>>>><<<><<<>>><>>>><><<>><<<>>>><<<>>>><<><<<>><<>><<<<>><<<><<<<><<<<><<<>>><><<<>>><<<>>><>><<<>><<>>>><<<><<>>>><>><<<>>>><<>>>><<>>><<>>><>>><<<<><<<<><>>><><><>>>><<<<>>>><<<><><<<>>>><<<<>><<<<>>>><<<<><<<><<<<><<><<>><<<><<><<<<>>><<<<><<<<>>><>>><<>>><>><<>>><>>>><<<<>>><>>><<<<>><<<<>>><><<<<>><<<>>><<>>>><<<>>>><<><<<<>>>><<><<<<><<<>>><><<<>><<<>>>><>><<>>>><<>>>><<>><<<<><>>><<<<>>><>>>><<<><<>><<<<>>>><<>>><>><<<><<<>>>><>>>><<<<><<>>><<<<>>>><<<>><<<>>><><<<><<<>>>><<<<><<>><<<<>>><>><<<>>>><<<<>><<<<>>><<<<><<<<><<>><<<>>><<<<>><>>>><<<>>><<><>>>><>>><>>>><<<><><<<>>>><>>><>><<<<><<>>>><<<<>>>><>>>><<<>>>><>>>><<<>><<<>>><>>><<<>>><<><>><<<<>><>><>><><<>>>><<<>><<>>>><>><><<<>><<>>><>>>><<<<>><<<<>>>><<<<><>>>><<<<>><>>>><<<>>>><<>>><<>>><<<>>><<<>><<>><>>><><<<>>><<<><>>><<<<>>>><<>>>><<>>><<><<<><><<<<>><<>>>><<<<>><>><<>><<<>>><<<>>>><<><<<>>>><<<<><<<<>><>><<><<>>>><>>>><<>><<>><<><<>>><<<<><><><<<<>>>><>><>>><>><<<>>><<<<>>><<>>><<<<>>>><>>>><>>>><<<>>><<>>>><>>><><<<>>><<<<>>><<<>><<>>><<><>>><<><<>>><<<>><>>>><<><<><<<><<<>>><>>>><><<><<<>>><<<<><>>><>>><<>><<><<<>>>><><>>><<<><<<<>>>><>><<<<>><>>>><>><><<<<>>>><<>>>><>>><<<>><<>><<<<>>><<>>><<>>><<<><<><>><>>>><>>>><<>><<<<>><<>>>><<<><<>><<<><>><<<<><<<<>>><<<<><<<<>>><<><<>>><<>><<>>>><>>><<>><<<<><<<>>><<<<>><<<<><>><<<<>>>><>><>>>><>><>><<<<><<<>><<<<>><<<><<<<>>><<>><>>><>>><>><<>>><<<<>><<>>><<><<>>>><<<<><<<>>>><>>><>>>><<>>>><>><<>>><<><<<>>>><<<<>><><>><<<<>>><<>><<>><<<<><><<><<<>><<<<>><<>><<<><<>><<<<>>><>><>>><<<>>>><><>><><<>><>>><<<<>><<>><>>>><<>><<<<>><<>><<>>>><<<>>>><<<>>><<><>>><<>>>><<>>><<<>>>><<<>>><<<>><<>>><<>><<<<>>><<<<>><<<<>>><<>>><>><<<>>>><<<>><<<>>><<>>><<>>>><<<>><<<>><<<<><<<<>>><<<<>>><<>><<<>>><<<<>>>><>>>><<<>><<<<><>>>><<<>><<>><<>>><><<>>><>><>>><<<>>><<<<>>><<<>>><>>>><>><>>>><><<>>><>><<<>>><><<>>>><<>>><<<<><>>><<>>><>>><>><><<>><>>><<>><<>>><<<><<<<>>>><<<<>>><<<<>><<<><><<>><<<>><>>>><<<>><<<<><<<<>><<<<>>>><<<>>><><<<<><<><>><>>><>>>><<><<<>>>><>><><>>><<><<<>>><<>><<<<><<<>>><<><<>>><<<>>><<<<><>><<>><>>><<<<>><<><>>><<<<>><<<<>><<>>>><<<<>>><<><<>>><>>><>><<>><<<<>>><<<>><<<>>><<<<>><<>>><<<>>>><<<>>>><<><><><<<<>><<<>>><<<<>>>><<>>><<<<>><>><<>><<>><<<>>>><<>>><<>><<<><<<>>><<>>><<<<>><>>>><>>>><>>><<>>><<>>>><<<>>><>>>><<<<>>><<<>><<<<>>><<>><<>>>><<<><<<<><<>><<<>>>><<<<>>><<<<><<>>>><>>>><<<<>><>>>><>>><<<>>><<>>><<<<><>>><<<<><<><><>>><>><>>>><<<<>><<<><>>>><<>>>><<>>>><<>>><<<>><<<><<><<>>><<><>>>><<<<>>>><<<>>><<<>>>><<<<>>><><<<<>>><>>>><<>><<<<><<<<>><<<>>><<>><<<><>>>><<<>><>><<>>>><<<<>><<<<>><<>>>><<<<>>><<>>>><<<<><<<>><<<<>>><<<<>>>><>><<<<>>>><<<>><<<>><<><<<>>><<<>>><<<>>>><<<<>><<<>>>><>>>><<><<><<>><<<>><<>>>><<>>>><><<<>>>><<<<>>><<>>>><><>>><<><<>>>><<>>>><<>>><<>>><<<>>><<<<><<>>>><<<<>><<<<><<<>>>><<>>>><<>>><<<><<<<><<<<>>>><><>><<<>>><<<>>><<>><<<>>><>>><<>><><<>><<>><<>><<<<>><<<>>><>>>><<<<>>>><<<>>>><>>>><<>><<<>>><<><<<<>><<<<><<<>>><><<<<><<<>><<<<>>><<>>><<<>>>><<<>>>><<>><<<<>><<<<>>><>><<<>>><<<<>>><>>><<><<<<><<>>>><<<<>><<<><>>><<>><<<<>>><<<>>><<>>>><<<<><>>><>>><><<><<>><>><<>><>>><<<<>>>><<<>>><<><<>>><<><<<>>><<><<<>>><<<><<<<>>><<><>>><<<<><<<>><<<<><>>>><>><<<<>>>><<<>>>><<<><><<<><<>>><<<<>><<<<>>>><>>>><>>><><<<<><<<<><<<><<>>><<<<><<<<>><<<<>>><<<>>><<><><>>><<<<>>><<<>>>><<><<<<>>><<<<>>>><>>><<<<>>>><<<>><<>>>><<<<>>><<<>>><>>><<<<><<<<>>>><<><<<>>>><<>><<<>>>><<<>><<<<>>>><<<>>><<<<>>><>><<<<>>>><<><<<><<>><><<<<><<<<>><<>>>><<<>><<<>><<>>>><<<>><<<>>><<<<><<<>>><><<<><<<><><<>>><>><<<<>>>><<<>>><<<<><>>><<<<>>><>><<<>>>><<<>>>><<<>><<<>>><<<><<<<><<<<><>>><>><<<><<<<>>><<<<><<>>><<<<>><<>>><<<<>>>><<<><<>>><><<<>>><<<>>><>><<>>>><><<><><<<<>>><<<<><<>>><>>><<<<>>>><<<>><<>><<<><<>><<>>>><<<<>>><<<<>>><>>>><<<<>><<<><<<>>><>>>><<<<>>><<<<>>>><<<>>><>><>><<<>>><<<<>>>><<>><<<>><>><><<<<>><>>>
diff --git a/2022/17-Pyroclastic-Flow/package.json b/2022/17-Pyroclastic-Flow/package.json
new file mode 100644
index 0000000..1619895
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/package.json
@@ -0,0 +1,8 @@
+{
+ "type": "module",
+ "dependencies": {
+ "eslint": "^8.30.0",
+ "eslint-plugin-node": "^11.1.0",
+ "jslint": "^0.12.1"
+ }
+}
diff --git a/2022/17-Pyroclastic-Flow/second.js b/2022/17-Pyroclastic-Flow/second.js
new file mode 100644
index 0000000..78becf6
--- /dev/null
+++ b/2022/17-Pyroclastic-Flow/second.js
@@ -0,0 +1,213 @@
+import * as fs from "fs";
+
+function load(filename) {
+ let data = fs.readFileSync(filename, "utf8").trim();
+ const l = data.length;
+ let i = 0;
+ return {
+ next: function () {
+ const c = data[i];
+ i = (i + 1) % l;
+ return c;
+ }
+ };
+}
+
+const masks = [
+ 0b1000000,
+ 0b0100000,
+ 0b0010000,
+ 0b0001000,
+ 0b0000100,
+ 0b0000010,
+ 0b0000001,
+];
+
+const shapes = [
+ [0b0011110],
+ [0b0001000, 0b0011100, 0b0001000],
+ [0b0000100, 0b0000100, 0b0011100],
+ [0b0010000, 0b0010000, 0b0010000, 0b0010000],
+ [0b0011000, 0b0011000],
+];
+const shapes_len = shapes.length;
+
+class Shape {
+ constructor(shape) {
+ this.shape = shape;
+ this.length = shape.length;
+ }
+ fall(field) { // returns true if the shape fell without colliding
+ for (let i=0; i<this.length; ++i) {
+ const next = field.get(i+1);
+ if (next === undefined || next & this.shape[i]) { //collision
+ field.solidify(this.shape);
+ return false;
+ }
+ }
+ field.fall();
+ return true;
+ }
+ shift(field, direction) {
+ let collision = false;
+ let tmp;
+ switch(direction) {
+ case ">":
+ tmp = this.shape.map(line => {
+ if (line & 0b1) { // we touch the right edge already
+ collision = true;
+ }
+ return line >>> 1;
+ });
+ break;
+ case "<":
+ tmp = this.shape.map(line => {
+ if (line & 0b1000000) { // we touch the left edge already
+ collision = true;
+ }
+ return line << 1;
+ });
+ break;
+ default:
+ throw "invalid direction character in shape shift: " + direction;
+ }
+ if (collision) {
+ return;
+ }
+ for (let i=0; i<this.length; ++i) {
+ if (field.get(i) & tmp[i]) { //collision
+ return;
+ }
+ }
+ this.shape = tmp;
+ }
+ print() {
+ this.shape.forEach(line => {
+ console.log(
+ line & 0b1000000 ? "#" : ".",
+ line & 0b0100000 ? "#" : ".",
+ line & 0b0010000 ? "#" : ".",
+ line & 0b0001000 ? "#" : ".",
+ line & 0b0000100 ? "#" : ".",
+ line & 0b0000010 ? "#" : ".",
+ line & 0b0000001 ? "#" : ".",
+ );
+ });
+ console.log("=======");
+ }
+}
+class Shaper {
+ constructor() {
+ this.index = 0;
+ }
+ next(field) {
+ const s = new Shape(shapes[this.index]);
+ field.accomodate(shapes[this.index].length + 3);
+ this.index = (this.index + 1) % shapes_len;
+ return s;
+ }
+}
+class Field {
+ constructor() {
+ this.data = [];
+ this.offset = 0;
+ }
+ accomodate(n) {
+ this.offset = 0;
+ for(let i=0; i<n; ++i) {
+ this.data.unshift(0);
+ }
+ }
+ fall() {
+ if (this.data[0] !== 0) { // we need to fall bellow the top line?
+ this.offset++;
+ } else {
+ this.data.shift();
+ }
+ }
+ get(offset) {
+ return this.data[this.offset + offset];
+ }
+ heightMap() {
+ const max = this.data.length;
+ let heights = [max, max, max, max, max, max, max];
+ heights.forEach((h, i) => {
+ for(let j=0; j<this.data.length; ++j) {
+ if (this.data[j] & masks[i]) {
+ heights[i] = j;
+ break;
+ }
+ }
+ });
+ return heights;
+ }
+ print() {
+ this.data.forEach(line => {
+ console.log(
+ line & 0b1000000 ? "#" : ".",
+ line & 0b0100000 ? "#" : ".",
+ line & 0b0010000 ? "#" : ".",
+ line & 0b0001000 ? "#" : ".",
+ line & 0b0000100 ? "#" : ".",
+ line & 0b0000010 ? "#" : ".",
+ line & 0b0000001 ? "#" : ".",
+ );
+ });
+ console.log("-------");
+ }
+ solidify(shape) {
+ for(let i=0; i<shape.length; ++i) {
+ this.data[i+this.offset] |= shape[i];
+ }
+ }
+}
+
+let example = load("example");
+let input = load("input");
+
+function solve(input) {
+ let field = new Field();
+ let shaper = new Shaper();
+ let height = 0;
+ let heightmaps = [];
+ const sky = 1000000000000;
+ for(let i=0; i<sky; ++i) {
+ let shape = shaper.next(field);
+ do {
+ shape.shift(field, input.next());
+ } while(shape.fall(field));
+ const heightmap = field.heightMap();
+ let cycle = -1;
+ let cycleHeight = 0;
+ heightmaps.forEach((h, n) => {
+ if (h.heightmap.every((v, idx) => v === heightmap[idx])) {
+ let nextCycle = heightmaps[(n+1)*2-1];
+ if (nextCycle !== undefined && nextCycle.heightmap.every((v, idx) => v === heightmap[idx])) {
+ let nextCycle2 = heightmaps[(n+1)*3-1];
+ if (nextCycle2 !== undefined && nextCycle2.heightmap.every((v, idx) => v === heightmap[idx])) {
+ cycle = n+1;
+ cycleHeight = field.data.length - h.height;
+ }
+ }
+ }
+ });
+ if (cycle > 0) {
+ console.log("got cycle of", cycle, "with a height of", cycleHeight, "after", i, "iterations");
+ const cycles = Math.floor((sky - i) / cycle);
+ i += cycles * cycle;
+ height = cycles * cycleHeight;
+ console.log("computed a height of", height, "after", cycles * cycle, "additional cycles");
+ heightmaps = [];
+ }
+ heightmaps.unshift({ heightmap: heightmap, height: field.data.length });
+ }
+ return height + field.data.length;
+}
+
+const exampleOutput = solve(example);
+if (exampleOutput !== 1514285714288) {
+ console.log("Example failed with height " + exampleOutput, "diff is", exampleOutput - 1514285714288, "positive means too high");
+ process.exit(1); // eslint-disable-line
+}
+
+console.log(solve(input));
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 23:32:04 +0000