[TASK] Cleaned up (and improved the performance a little) for day 17

functions/package.json

@@ -7,7 +7,8 @@
     "shell": "npm run build && firebase functions:shell",
     "start": "npm run shell",
     "deploy": "firebase deploy --only functions",
-    "logs": "firebase functions:log"
+    "logs": "firebase functions:log",
+    "debug-day17": "ts-node src/day17.ts"
   },
   "engines": {
     "node": "16"
@@ -24,6 +25,7 @@
     "eslint-config-google": "^0.14.0",
     "eslint-plugin-import": "^2.22.0",
     "firebase-functions-test": "^0.2.0",
+    "ts-node": "^10.4.0",
     "typescript": "^3.8.0"
   },
   "private": true

functions/src/Grid.ts

@@ -0,0 +1,94 @@
+import Vector2 from "./vector2";
+
+class Grid<T> {
+
+  data: T[];
+  outOfBoundsResult?: T;
+  maxX: number;
+  maxY: number;
+
+  constructor(data: T[], maxX: number, outOfBoundsResult: T | undefined = undefined) {
+
+    if (data.length % maxX !== 0) throw Error("Invalid grid data length, must be a multiple of the width");
+
+    this.data = data;
+    this.outOfBoundsResult = outOfBoundsResult;
+    this.maxX = maxX;
+    this.maxY = this.data.length / maxX;
+  }
+
+  at(x: number, y: number): T {
+
+    if (!this.isInBounds(x, y)) {
+      if (this.outOfBoundsResult) {
+        return this.outOfBoundsResult
+      } else {
+        throw Error(`Invalid coordinate: (${x}, ${y})`);
+      }
+
+    }
+
+    return this.data[this.index(x, y)];
+  }
+
+  setAt(x: number, y: number, value: T): void {
+
+    if (!this.isInBounds(x, y)) {
+      throw Error(`Invalid coordinate: (${x}, ${y})`);
+    }
+    this.data[this.index(x, y)] = value;
+  }
+
+  allPositions(): Vector2[] {
+    const res =[];
+    for (let y = 0; y < this.maxY; y++) {
+      for (let x = 0; x < this.maxX; x++) {
+        res.push(new Vector2(x, y));
+      }
+    }
+    return res;
+  }
+
+  isInBounds(x: number, y: number): boolean {
+    return x >= 0 && x < this.maxX && y >= 0 && y < this.maxY;
+  }
+
+  inBoundsNeighbors(x: number, y: number, includeDiagonal = false): Vector2[] {
+
+    const res = [
+      new Vector2(x + 1, y),
+      new Vector2(x - 1, y),
+      new Vector2(x, y + 1),
+      new Vector2(x, y - 1)
+    ];
+    if (includeDiagonal) {
+      res.push(
+        new Vector2(x + 1, y + 1),
+        new Vector2(x + 1, y - 1),
+        new Vector2(x - 1, y + 1),
+        new Vector2(x - 1, y - 1)
+      );
+    }
+    return res.filter(v => this.isInBounds(v.x, v.y));
+  }
+
+  /**
+   * Pastes the given grid into this grid, with it's top left position at the given coordinate
+   */
+  paste(grid: Grid<T>, posX: number, posY: number): void {
+
+    if (posX + grid.maxX > this.maxX || posY + grid.maxY > this.maxY) throw Error(`Can't paste grid at (${posX}, ${posY}), this grid is not big enough`);
+
+    for (let y = 0; y < grid.maxY; y++) {
+      for (let x = 0; x < grid.maxX; x++) {
+        this.setAt(posX + x, posY + y, grid.at(x, y));
+      }
+    }
+  }
+
+  index(x: number, y: number): number {
+    return x + y * this.maxX;
+  }
+}
+
+export default Grid;

functions/src/day14.ts

@@ -0,0 +1,151 @@
+import Day from "./day";
+import Utils from "./utils";
+
+type CharCounts = {[key: string]: bigint};
+
+class Day14 implements Day {
+
+  part1(input: string[]): number | string {
+
+    const { orig, mapping } = Day14.parseInput(input);
+
+    let current = orig;
+    for (let step = 0; step < 10; step++) {
+      current = this.executeStep(current, mapping);
+    }
+
+    const counts: {[key: string]: number} = {};
+    for (const c of current) {
+      if (c in counts) {
+        counts[c]++;
+      } else {
+        counts[c] = 1;
+      }
+    }
+
+
+    return Math.max(...Object.values(counts)) - Math.min(...Object.values(counts));
+  }
+
+  private static parseInput(input: string[]): { orig: string, mapping: Map<string, Map<string, string>>} {
+    const orig = input[0];
+
+    const mapping = new Map<string, Map<string, string>>();
+    for (const line of input.slice(2)) {
+
+      const splitIndex = line.indexOf("->");
+      const from = line.substr(0, splitIndex).trim();
+      const firstChar = from[0];
+      const secondChar = from[1];
+      const to = line.substr(splitIndex + 2).trim();
+
+      const existingMapping = mapping.get(firstChar);
+      if (existingMapping) {
+        existingMapping.set(secondChar, to);
+      } else {
+        mapping.set(firstChar, new Map<string, string>([[secondChar, to]]));
+      }
+    }
+
+    return { orig, mapping };
+  }
+
+  private executeStep(orig: string, mapping: Map<string, Map<string, string>>): string {
+
+    let res = "";
+    for (let i = 0; i < orig.length - 1; i++) {
+
+      const char = orig[i];
+      res += char;
+      const firstCharMatch = mapping.get(char);
+      if (firstCharMatch) {
+        const secondChar = orig[i + 1];
+        const toAdd = firstCharMatch.get(secondChar);
+        if (toAdd) {
+          res += toAdd;
+        }
+      }
+    }
+    // Add the last character as it's not included in the result
+    res += orig[orig.length - 1];
+
+    return res;
+  }
+
+  part2(input: string[]): number | string {
+
+    const { orig, mapping } = Day14.parseInput(input);
+
+    const counts: CharCounts = {};
+    const cache = new Map<string, CharCounts>();
+    for (let i = 0; i < orig.length - 1; i++) {
+
+      const firstChar = orig[i];
+      const secondChar = orig[i + 1];
+
+      this.addOne(firstChar, counts);
+      this.mergeIntoLeft(counts, this.calculateRecursive(firstChar, secondChar, mapping, 40, cache));
+
+    }
+    this.addOne(orig[orig.length - 1], counts);
+
+    return (Utils.bigMax(Object.values(counts)) - Utils.bigMin(Object.values(counts))).toString();
+  }
+
+  /**
+   * Returns the amount of added element of each type
+   */
+  calculateRecursive(firstChar: string, secondChar: string, mappings: Map<string, Map<string, string>>, stepsLeft: number, cache: Map<string, CharCounts>): CharCounts {
+
+    if (stepsLeft === 0) return {};
+
+    const cacheKey = firstChar + secondChar + stepsLeft;
+    const cachedResult = cache.get(cacheKey);
+    if (cachedResult) return cachedResult;
+
+    const res = {};
+
+    const firstCharMatch = mappings.get(firstChar);
+    if (firstCharMatch) {
+      const toAdd = firstCharMatch.get(secondChar);
+      if (toAdd) {
+        this.addOne(toAdd, res);
+        this.mergeIntoLeft(res, this.calculateRecursive(firstChar, toAdd, mappings, stepsLeft - 1, cache));
+        this.mergeIntoLeft(res, this.calculateRecursive(toAdd, secondChar, mappings, stepsLeft - 1, cache));
+      }
+    }
+
+    cache.set(cacheKey, res);
+    return res;
+
+  }
+
+  mergeIntoLeft(left: CharCounts, right: CharCounts): void {
+
+    for (const rightKey in right) {
+      if (rightKey in left) {
+        left[rightKey] += right[rightKey];
+      } else {
+        left[rightKey] = right[rightKey];
+      }
+    }
+  }
+
+  addOne(char: string, counts: CharCounts): void {
+
+    if (char in counts) {
+      counts[char]++;
+    } else {
+      counts[char] = 1n;
+    }
+  }
+
+  // calculateCounts(pair: string, mappings: Map<string, Map<string, string>>, cache: Map<string, Map<number, {[key: string]: bigint}>>): {[key: string]: bigint} {
+  //
+  //
+  //
+  // }
+
+}
+
+export default Day14;

functions/src/day15.ts

@@ -0,0 +1,80 @@
+import Day from "./day";
+import Grid from "./Grid";
+import Vector2 from "./vector2";
+
+class Day15 implements Day {
+
+  part1(input: string[]): number | string {
+
+    return this.findLowestRiskScore(Day15.parseInput(input));
+
+  }
+
+  part2(input: string[]): number | string {
+
+    const grid = Day15.parseInput(input);
+
+    const bigGrid = new Grid(Array((grid.maxX * 5) * (grid.maxY * 5)).fill(0), grid.maxX * 5, Number.MAX_SAFE_INTEGER);
+
+    for (let y = 0; y < 5; y++) {
+      for (let x = 0; x < 5; x++) {
+        const subGrid = new Grid(grid.data.map(c => c + x + y).map(c => c > 9 ? c % 9 : c), grid.maxX);
+        bigGrid.paste(subGrid, x * grid.maxX, y * grid.maxY);
+      }
+    }
+
+    return this.findLowestRiskScore(bigGrid);
+  }
+
+
+  private findLowestRiskScore(grid: Grid<number>): number {
+
+    const start = new Vector2(0, 0);
+    const destination = new Vector2(grid.maxX - 1, grid.maxY - 1);
+
+    const distances = new Grid(new Array(grid.data.length).fill(Number.MAX_SAFE_INTEGER), grid.maxX);
+    distances.setAt(start.x, start.y, 0);
+
+    const searchStack = [start];
+
+    while (searchStack.length > 0) {
+
+      // Simulate a priority queue on distance:
+      searchStack.sort((a, b) => distances.at(b.x, b.y) - distances.at(a.x, a.y));
+
+      const cur = searchStack.pop();
+
+      if (!cur) throw Error("???");
+
+      if (cur.x === destination.x && cur.y === destination.y) {
+        break;
+      }
+
+      const curDist = distances.at(cur.x, cur.y);
+
+      const neighbors = grid.inBoundsNeighbors(cur.x, cur.y);
+
+
+      for (const neighbor of neighbors) {
+
+        const newDist = curDist + grid.at(neighbor.x, neighbor.y);
+        if (newDist < distances.at(neighbor.x, neighbor.y)) {
+          distances.setAt(neighbor.x, neighbor.y, newDist);
+          searchStack.push(neighbor);
+        }
+      }
+    }
+
+    return distances.at(destination.x, destination.y);
+  }
+
+  private static parseInput(input: string[]): Grid<number> {
+
+    return new Grid<number>(
+      input.flatMap(l => l.split("").map(n => parseInt(n))),
+      input[0].length, Number.MAX_SAFE_INTEGER);
+
+  }
+}
+
+export default Day15;

functions/src/day16.ts

@@ -0,0 +1,150 @@
+import Day from "./day";
+import Utils from "./utils";
+
+class Day16 implements Day {
+
+  part1(input: string[]): number | string {
+
+    const packet = Packet.parse(input[0]);
+
+    return Day16.recursiveSumVersionNumbers(packet);
+  }
+
+  part2(input: string[]): number | string {
+
+    return Packet.parse(input[0]).calculateValue().toString();
+  }
+
+  static recursiveSumVersionNumbers(packet: Packet): number {
+
+    if (typeof packet.content === "bigint") {
+      return packet.version;
+    } else {
+      return packet.version + Utils.sum(packet.content.map(sp => Day16.recursiveSumVersionNumbers(sp)));
+    }
+
+  }
+
+}
+
+class Packet {
+
+  static readonly SUM_TYPE = 0
+  static readonly PROD_TYPE = 1;
+  static readonly MIN_TYPE = 2;
+  static readonly MAX_TYPE = 3;
+  static readonly LITERAL_TYPE = 4;
+  static readonly GT_TYPE = 5;
+  static readonly LT_TYPE = 6;
+  static readonly EQ_TYPE = 7;
+
+  static readonly VERSION_LENGTH = 3;
+  static readonly TYPE_LENGTH = 3;
+  static readonly LENGTH_TYPE_LENGTH = 1;
+  static readonly SUBPACKET_SIZE_LENGTH = 15;
+  static readonly SUBPACKET_COUNT_LENGTH = 11;
+  static readonly LITERAL_PART_LENGTH = 5;
+
+  version: number;
+  type: number;
+
+  content: Packet[] | bigint
+  binaryLength: number;
+
+  constructor(version: number, type: number, content: Packet[] | bigint, binaryLength: number) {
+    this.version = version;
+    this.type = type;
+    this.content = content;
+    this.binaryLength = binaryLength;
+  }
+
+  calculateValue(): bigint {
+
+    if (typeof this.content === "bigint") return this.content;
+
+    const subValues = this.content.map(c => c.calculateValue());
+
+    if (this.type === Packet.SUM_TYPE) {
+      return Utils.bigSum(subValues)
+    } else if (this.type === Packet.PROD_TYPE) {
+      return subValues.reduce((a, b) => a * b, 1n);
+    } else if (this.type === Packet.MIN_TYPE) {
+      return Utils.bigMin(subValues);
+    } else if (this.type === Packet.MAX_TYPE) {
+      return Utils.bigMax(subValues);
+    } else if (this.type === Packet.GT_TYPE) {
+      return subValues[0] > subValues[1] ? 1n : 0n;
+    } else if (this.type === Packet.LT_TYPE) {
+      return subValues[0] < subValues[1] ? 1n : 0n;
+    } else if (this.type === Packet.EQ_TYPE) {
+      return subValues[0] === subValues[1] ? 1n : 0n;
+    } else {
+      // Shouldn't happen
+      throw Error("Unsupported packet type: " + this.type);
+    }
+  }
+
+  static parse(input: string): Packet {
+    return this.parseBinaryInput(Packet.toBinary(input));
+  }
+
+  static toBinary(input: string): string {
+    return input.split("").map(s => parseInt(s, 16).toString(2).padStart(4, "0")).join("");
+  }
+
+  static parseBinaryInput(binaryInput: string, start = 0): Packet {
+
+    const version = parseInt(binaryInput.substr(start, Packet.VERSION_LENGTH), 2);
+    const type = parseInt(binaryInput.substr(start + Packet.VERSION_LENGTH, Packet.TYPE_LENGTH), 2);
+
+    const contentStart = start + Packet.VERSION_LENGTH + Packet.TYPE_LENGTH;
+
+    if (type === Packet.LITERAL_TYPE) {
+      // Literal value
+      let i = 0;
+      let binaryLiteral = "0b";
+      do {
+        binaryLiteral += binaryInput.substr(contentStart + (Packet.LITERAL_PART_LENGTH * i) + 1, Packet.LITERAL_PART_LENGTH - 1);
+        i++;
+      } while(binaryInput[contentStart + (Packet.LITERAL_PART_LENGTH * (i - 1))] === "1")
+      return new Packet(version, type, BigInt(binaryLiteral), Packet.VERSION_LENGTH + Packet.TYPE_LENGTH + (Packet.LITERAL_PART_LENGTH * i))
+    } else {
+      // Operator packets, so let's parse the subpackets:
+      const lengthType = binaryInput[contentStart];
+
+      if (lengthType === "0") {
+        const subpacketsLength = parseInt(binaryInput.substr(contentStart + Packet.LENGTH_TYPE_LENGTH, Packet.SUBPACKET_SIZE_LENGTH), 2);
+
+        const firstPacketStart = contentStart + Packet.LENGTH_TYPE_LENGTH + Packet.SUBPACKET_SIZE_LENGTH;
+        let curStart = firstPacketStart;
+        const subPackets = [];
+        while (curStart - firstPacketStart < subpacketsLength) {
+          const subPacket = this.parseBinaryInput(binaryInput, curStart);
+          curStart += subPacket.binaryLength;
+          subPackets.push(subPacket);
+        }
+
+        return new Packet(version, type, subPackets, curStart - start);
+
+      } else {
+
+        const subpacketCount = parseInt(binaryInput.substr(contentStart + Packet.LENGTH_TYPE_LENGTH, Packet.SUBPACKET_COUNT_LENGTH), 2);
+
+        let curStart = contentStart + Packet.LENGTH_TYPE_LENGTH + Packet.SUBPACKET_COUNT_LENGTH;
+        const subPackets = [];
+        for (let i = 0; i < subpacketCount; i++) {
+          const subPacket = this.parseBinaryInput(binaryInput, curStart);
+          curStart += subPacket.binaryLength;
+          subPackets.push(subPacket);
+        }
+
+        return new Packet(version, type, subPackets, curStart - start);
+      }
+    }
+
+  }
+
+}
+
+export default Day16;
+

functions/src/day17.ts

@@ -0,0 +1,199 @@
+import Day from "./day";
+
+class Day17 implements Day {
+
+  // steps = 3
+  // y = 1 -> 1 + 0 + -1 = 0
+  // y = 2 -> 2 + 1 + 0 = 3
+  // y = 3 -> 3 + 2 + 1 = 6
+  // y = 4 -> 4 + 3 + 2 = 9
+  // y = 5 -> 5 + 4 + 3 = 12
+
+  // steps = 4
+  // y = 1 -> -2
+  // y = 2 -> 2
+  // y = 3 -> 6
+  // y = 4 -> 10
+
+  // y = 0
+  // steps = 1 -> 0            =  0
+  // steps = 2 -> 0 - 1       =  -1
+  // steps = 3 -> 0 - 1 - 2   =  -3
+  // steps = 4 -> 0 - 1- 2 - 3=  -6
+  // steps = 5 -> 0-1-2-3-4   = -10
+  // steps = 6 -> 0-1-2-3-4-5 = -15
+
+  part1(input: string[]): number | string {
+
+    const targetArea = TargetArea.parse(input[0]);
+
+    // Assuming v_y0 > 0, the maximum height the probe reaches is triangle(y).
+    // After reaching the top, the probe starts falling back down, taking "v_y0" steps to get back to a height of 0.
+    // After that it has a speed of v_y0 - 1.
+
+    // Note that the triangle value of x must be at least the minimal x of the target area, otherwise the probe won't
+    // reach the target area before it's velocity reaches zero:
+    const v_x0_min = Day17.triangleInvCeil(targetArea.minX);
+    // Calculate the x-position we reach after v_x0 steps:
+    const x_min = Day17.triangle(v_x0_min);
+
+    if (targetArea.isInX(x_min)) {
+      // We have an x-speed that reaches the target area in x_min steps and stays there (e.g. reaches velocity zero in the target area),
+      // so we can just find the biggest y that at some point ends up in the target area.
+      // We already know that the y speed when the "probe" comes down is:
+      // -v_y0 - 1
+      // So if we choose as starting y that is one higher than the minimal y value, we end up in the bottom of the target area, while
+      // reaching the maximum height:
+      const v_y0_max = Math.abs(targetArea.minY) - 1;
+      return Day17.triangle(v_y0_max);
+    } else {
+      throw Error("Unsupported target area, only a target area with an x values that is a triangle number is supported");
+    }
+  }
+
+  part2(input: string[]): number | string {
+
+    const targetArea = TargetArea.parse(input[0]);
+
+    const v_x0_min = Day17.triangleInvCeil(targetArea.minX);
+    const v_x0_max_static = Day17.triangleInvFloor(targetArea.maxX);
+    const maxYStepsBelowZero = Day17.triangleInvCeil(Math.abs(targetArea.minY));
+
+    let solutionCount = 0;
+
+    for (let v_x0 = v_x0_min; v_x0 <= targetArea.maxX; v_x0++) {
+      for (let v_y0 = targetArea.minY; v_y0 < Math.abs(targetArea.minY); v_y0++) {
+
+        // If v_x0 <= v_x0_max_static, we end up in a position where eventually all x-es fall in the valid range
+        // So in that case, we base the max steps on the y values.
+        const maxSteps = v_x0 <= v_x0_max_static
+          ? (v_y0 < 0 ? maxYStepsBelowZero : 2 * v_y0 + 1 + maxYStepsBelowZero)
+          : v_x0_max_static;
+
+        for (let steps = 1; steps <= maxSteps; steps++) {
+          const xRangeResult = this.isInXAfterSteps(v_x0, steps, targetArea);
+          if (xRangeResult === RangeResult.TOO_HIGH) {
+            break;
+          } if (xRangeResult === RangeResult.YES) {
+            // Check what y values work for this x and step count:
+              const yRangeResult = this.isInYAfterSteps(v_y0, steps, targetArea);
+              if (yRangeResult === RangeResult.YES) {
+                // console.log(`${v_x0}, ${v_y0}`)
+                solutionCount++;
+                break;
+              }
+            }
+        }
+      }
+    }
+    return solutionCount;
+
+  }
+
+  isInXAfterSteps(v_x0: number, steps: number, targetArea: TargetArea): RangeResult {
+
+    if (steps >= v_x0) {
+      // reached final position, which is the triangle number of the initial speed:
+      return targetArea.isInX(Day17.triangle(v_x0));
+    } else {
+      // On our way to the final position:
+      const x = Day17.triangle(v_x0) - Day17.triangle(v_x0 - steps);
+      return targetArea.isInX(x);
+    }
+
+  }
+
+  isInYAfterSteps(v_y0: number, steps: number, targetArea: TargetArea): RangeResult {
+
+    if (targetArea.maxY >= 0) throw Error("Only target area's below the starting point are supported")
+
+    if (v_y0 > 0) {
+      if (steps < 2 * v_y0) {
+        // We haven't gone below the
+        return RangeResult.TOO_HIGH;
+      } else {
+        // This is equivalent to firing with a negative y speed after v_y0 * 2 + 1 steps (so the steps left = steps - 2 * v_y0 - 1)
+        return this.isInYAfterSteps(-v_y0 - 1, steps - 2 * v_y0 - 1, targetArea);
+      }
+    } else {
+      // Firing downward:
+      const y = - Day17.calcPositionAfterIncreasingVelocity(Math.abs(v_y0), steps);
+      return targetArea.isInY(y);
+    }
+  }
+
+  static calcPositionAfterIncreasingVelocity(v: number, steps: number): number {
+    if (v < 0) throw Error("Velocity must be positive");
+
+    return Day17.triangle(v - 1 + steps) - Day17.triangle(v - 1);
+  }
+
+  static triangle(n: number): number {
+    return (n*(n + 1)) / 2;
+  }
+
+  static triangleInvCeil(x: number): number {
+    return Math.ceil(this.triangleInv(x));
+  }
+
+  static triangleInvFloor(x: number): number {
+    return Math.floor(this.triangleInv(x));
+  }
+
+  static triangleInv(x: number): number {
+    return (Math.sqrt(8 * x + 1) - 1) / 2;
+  }
+
+}
+
+enum RangeResult {
+  TOO_LOW = -1,
+  TOO_HIGH = 0,
+  YES = 1
+}
+
+class TargetArea {
+
+  minX: number;
+  maxX: number;
+  minY: number;
+  maxY: number;
+
+
+  constructor(minX: number, maxX: number, minY: number, maxY: number) {
+    this.minX = minX;
+    this.maxX = maxX;
+    this.minY = minY;
+    this.maxY = maxY;
+  }
+
+  static parse(input: string): TargetArea {
+    const regex = /^target area: x=(-?[0-9]+)\.\.(-?[0-9]+), y=(-?[0-9]+)..(-?[0-9]+)$/i;
+    const match = input.trim().match(regex);
+
+    if (!match || match.length < 5) {
+      throw Error("Invalid input: '" + input + "'");
+    }
+
+    return new TargetArea(
+        parseInt(match[1]),
+        parseInt(match[2]),
+        parseInt(match[3]),
+        parseInt(match[4]),
+    )
+  }
+
+  isInX(x: number): RangeResult {
+    if (x < this.minX) return RangeResult.TOO_LOW;
+    else if (x > this.maxX) return RangeResult.TOO_HIGH;
+    else return RangeResult.YES;
+  }
+
+  isInY(y: number): RangeResult {
+    if (y < this.minY) return RangeResult.TOO_LOW;
+    else if (y > this.maxY) return RangeResult.TOO_HIGH;
+    else return RangeResult.YES;
+  }
+}
+
+export default Day17;

functions/src/index.ts

@@ -15,6 +15,10 @@ import Day10 from "./day10";
 import Day11 from "./day11";
 import Day12 from "./day12";
 import Day13 from "./day13";
+import Day14 from "./day14";
+import Day15 from "./day15";
+import Day16 from "./day16";
+import Day17 from './day17';
 
 
 // // Start writing Firebase Functions
@@ -44,6 +48,10 @@ export const day = {
   11: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day11(), request, response) }),
   12: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day12(), request, response) }),
   13: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day13(), request, response) }),
+  14: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day14(), request, response) }),
+  15: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day15(), request, response) }),
+  16: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day16(), request, response) }),
+  17: functions.region("europe-west1").https.onRequest((request, response) => { processDay(new Day17(), request, response) }),
 
 }
 

functions/src/utils.ts

@@ -21,6 +21,14 @@ class Utils {
     return values.reduce((a, b) => a + b);
   }
 
+  static bigMax(values: bigint[]): bigint {
+    return values.reduce((a, b) => a > b ? a : b);
+  }
+
+  static bigMin(values: bigint[]): bigint {
+    return values.reduce((a, b) => a < b ? a : b);
+  }
+
   static zeroes(length: number): number[] {
 
     const res = [];

functions/yarn.lock

@@ -23,6 +23,18 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
+"@cspotcode/source-map-consumer@0.8.0":
+  version "0.8.0"
+  resolved "https://registry.yarnpkg.com/@cspotcode/source-map-consumer/-/source-map-consumer-0.8.0.tgz#33bf4b7b39c178821606f669bbc447a6a629786b"
+  integrity sha512-41qniHzTU8yAGbCp04ohlmSrZf8bkf/iJsl3V0dRGsQN/5GFfx+LbCSsCpp2gqrqjTVg/K6O8ycoV35JIwAzAg==
+
+"@cspotcode/source-map-support@0.7.0":
+  version "0.7.0"
+  resolved "https://registry.yarnpkg.com/@cspotcode/source-map-support/-/source-map-support-0.7.0.tgz#4789840aa859e46d2f3173727ab707c66bf344f5"
+  integrity sha512-X4xqRHqN8ACt2aHVe51OxeA2HjbcL4MqFqXkrmQszJ1NOUuUu5u6Vqx/0lZSVNku7velL5FC/s5uEAj1lsBMhA==
+  dependencies:
+    "@cspotcode/source-map-consumer" "0.8.0"
+
 "@eslint/eslintrc@^0.4.3":
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-0.4.3.tgz#9e42981ef035beb3dd49add17acb96e8ff6f394c"
@@ -278,6 +290,26 @@
   resolved "https://registry.yarnpkg.com/@tootallnate/once/-/once-2.0.0.tgz#f544a148d3ab35801c1f633a7441fd87c2e484bf"
   integrity sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A==
 
+"@tsconfig/node10@^1.0.7":
+  version "1.0.8"
+  resolved "https://registry.yarnpkg.com/@tsconfig/node10/-/node10-1.0.8.tgz#c1e4e80d6f964fbecb3359c43bd48b40f7cadad9"
+  integrity sha512-6XFfSQmMgq0CFLY1MslA/CPUfhIL919M1rMsa5lP2P097N2Wd1sSX0tx1u4olM16fLNhtHZpRhedZJphNJqmZg==
+
+"@tsconfig/node12@^1.0.7":
+  version "1.0.9"
+  resolved "https://registry.yarnpkg.com/@tsconfig/node12/-/node12-1.0.9.tgz#62c1f6dee2ebd9aead80dc3afa56810e58e1a04c"
+  integrity sha512-/yBMcem+fbvhSREH+s14YJi18sp7J9jpuhYByADT2rypfajMZZN4WQ6zBGgBKp53NKmqI36wFYDb3yaMPurITw==
+
+"@tsconfig/node14@^1.0.0":
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@tsconfig/node14/-/node14-1.0.1.tgz#95f2d167ffb9b8d2068b0b235302fafd4df711f2"
+  integrity sha512-509r2+yARFfHHE7T6Puu2jjkoycftovhXRqW328PDXTVGKihlb1P8Z9mMZH04ebyajfRY7dedfGynlrFHJUQCg==
+
+"@tsconfig/node16@^1.0.2":
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/@tsconfig/node16/-/node16-1.0.2.tgz#423c77877d0569db20e1fc80885ac4118314010e"
+  integrity sha512-eZxlbI8GZscaGS7kkc/trHTT5xgrjH3/1n2JDwusC9iahPKWMRvRjJSAN5mCXviuTGQ/lHnhvv8Q1YTpnfz9gA==
+
 "@types/body-parser@*":
   version "1.19.2"
   resolved "https://registry.yarnpkg.com/@types/body-parser/-/body-parser-1.19.2.tgz#aea2059e28b7658639081347ac4fab3de166e6f0"
@@ -474,11 +506,21 @@ acorn-jsx@^5.3.1:
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
   integrity sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==
 
+acorn-walk@^8.1.1:
+  version "8.2.0"
+  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-8.2.0.tgz#741210f2e2426454508853a2f44d0ab83b7f69c1"
+  integrity sha512-k+iyHEuPgSw6SbuDpGQM+06HQUa04DZ3o+F6CSzXMvvI5KMvnaEqXe+YVe555R9nn6GPt404fos4wcgpw12SDA==
+
 acorn@^7.4.0:
   version "7.4.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.4.1.tgz#feaed255973d2e77555b83dbc08851a6c63520fa"
   integrity sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==
 
+acorn@^8.4.1:
+  version "8.6.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.6.0.tgz#e3692ba0eb1a0c83eaa4f37f5fa7368dd7142895"
+  integrity sha512-U1riIR+lBSNi3IbxtaHOIKdH8sLFv3NYfNv8sg7ZsNhcfl4HF2++BfqqrNAxoCLQW1iiylOj76ecnaUxz+z9yw==
+
 agent-base@6:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-6.0.2.tgz#49fff58577cfee3f37176feab4c22e00f86d7f77"
@@ -530,6 +572,11 @@ ansi-styles@^4.0.0, ansi-styles@^4.1.0:
   dependencies:
     color-convert "^2.0.1"
 
+arg@^4.1.0:
+  version "4.1.3"
+  resolved "https://registry.yarnpkg.com/arg/-/arg-4.1.3.tgz#269fc7ad5b8e42cb63c896d5666017261c144089"
+  integrity sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA==
+
 argparse@^1.0.7:
   version "1.0.10"
   resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
@@ -745,6 +792,11 @@ cors@^2.8.5:
     object-assign "^4"
     vary "^1"
 
+create-require@^1.1.0:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/create-require/-/create-require-1.1.1.tgz#c1d7e8f1e5f6cfc9ff65f9cd352d37348756c333"
+  integrity sha512-dcKFX3jn0MpIaXjisoRvexIJVEKzaq7z2rZKxf+MSr9TkdmHmsU4m2lcLojrj/FHl8mk5VxMmYA+ftRkP/3oKQ==
+
 cross-spawn@^7.0.2:
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
@@ -814,6 +866,11 @@ dicer@^0.3.0:
   dependencies:
     streamsearch "0.1.2"
 
+diff@^4.0.1:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.2.tgz#60f3aecb89d5fae520c11aa19efc2bb982aade7d"
+  integrity sha512-58lmxKSA4BNyLz+HHMUzlOEpg09FV+ev6ZMe3vJihgdxzgcwZ8VoEEPmALCZG9LmqfVoNMMKpttIYTVG6uDY7A==
+
 doctrine@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-2.1.0.tgz#5cd01fc101621b42c4cd7f5d1a66243716d3f39d"
@@ -1903,6 +1960,11 @@ make-dir@^3.0.0:
   dependencies:
     semver "^6.0.0"
 
+make-error@^1.1.1:
+  version "1.3.6"
+  resolved "https://registry.yarnpkg.com/make-error/-/make-error-1.3.6.tgz#2eb2e37ea9b67c4891f684a1394799af484cf7a2"
+  integrity sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==
+
 media-typer@0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
@@ -2515,6 +2577,24 @@ tr46@~0.0.3:
   resolved "https://registry.yarnpkg.com/tr46/-/tr46-0.0.3.tgz#8184fd347dac9cdc185992f3a6622e14b9d9ab6a"
   integrity sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=
 
+ts-node@^10.4.0:
+  version "10.4.0"
+  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-10.4.0.tgz#680f88945885f4e6cf450e7f0d6223dd404895f7"
+  integrity sha512-g0FlPvvCXSIO1JDF6S232P5jPYqBkRL9qly81ZgAOSU7rwI0stphCgd2kLiCrU9DjQCrJMWEqcNSjQL02s6d8A==
+  dependencies:
+    "@cspotcode/source-map-support" "0.7.0"
+    "@tsconfig/node10" "^1.0.7"
+    "@tsconfig/node12" "^1.0.7"
+    "@tsconfig/node14" "^1.0.0"
+    "@tsconfig/node16" "^1.0.2"
+    acorn "^8.4.1"
+    acorn-walk "^8.1.1"
+    arg "^4.1.0"
+    create-require "^1.1.0"
+    diff "^4.0.1"
+    make-error "^1.1.1"
+    yn "3.1.1"
+
 tsconfig-paths@^3.11.0:
   version "3.12.0"
   resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.12.0.tgz#19769aca6ee8f6a1a341e38c8fa45dd9fb18899b"
@@ -2740,6 +2820,11 @@ yargs@^16.1.1:
     y18n "^5.0.5"
     yargs-parser "^20.2.2"
 
+yn@3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
+  integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
+
 yocto-queue@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/yocto-queue/-/yocto-queue-0.1.0.tgz#0294eb3dee05028d31ee1a5fa2c556a6aaf10a1b"

input/day/14-example.http

@@ -0,0 +1,23 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-14
+Content-Type: text/plain
+
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
+
+###

input/day/14.http

@@ -0,0 +1,107 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-14
+Content-Type: text/plain
+
+CNBPHFBOPCSPKOFNHVKV
+
+CS -> S
+FB -> F
+VK -> V
+HO -> F
+SO -> K
+FK -> B
+VS -> C
+PS -> H
+HH -> P
+KH -> V
+PV -> V
+CB -> N
+BB -> N
+HB -> B
+HV -> O
+NC -> H
+NF -> B
+HP -> B
+HK -> S
+SF -> O
+ON -> K
+VN -> V
+SB -> H
+SK -> H
+VH -> N
+KN -> C
+CC -> N
+BF -> H
+SN -> N
+KP -> B
+FO -> N
+KO -> V
+BP -> O
+OK -> F
+HC -> B
+NH -> O
+SP -> O
+OO -> S
+VC -> O
+PC -> F
+VB -> O
+FF -> S
+BS -> F
+KS -> F
+OV -> P
+NB -> O
+CF -> F
+SS -> V
+KV -> K
+FP -> F
+KC -> C
+PF -> C
+OS -> C
+PN -> B
+OP -> C
+FN -> F
+OF -> C
+NP -> C
+CK -> N
+BN -> K
+BO -> K
+OH -> S
+BH -> O
+SH -> N
+CH -> K
+PO -> V
+CN -> N
+BV -> F
+FV -> B
+VP -> V
+FS -> O
+NV -> P
+PH -> C
+HN -> P
+VV -> C
+NK -> K
+CO -> N
+NS -> P
+VO -> P
+CP -> V
+OC -> S
+PK -> V
+NN -> F
+SC -> P
+BK -> F
+BC -> P
+FH -> B
+OB -> O
+FC -> N
+PB -> N
+VF -> N
+PP -> S
+HS -> O
+HF -> N
+KK -> C
+KB -> N
+SV -> N
+KF -> K
+CV -> N
+NO -> P
+
+###

input/day/15-example.http

@@ -0,0 +1,15 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-15
+Content-Type: text/plain
+
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
+
+###

input/day/15.http

@@ -0,0 +1,105 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-15
+Content-Type: text/plain
+
+6763679391685199321216293379889971448824578974299594779321588588854917594121939988499223486918759869
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+
+###

input/day/16-example.http

@@ -0,0 +1,48 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+D2FE28
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+38006F45291200
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+EE00D40C823060
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+8A004A801A8002F478
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+620080001611562C8802118E34
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+C0015000016115A2E0802F182340
+
+###
+
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
+A0016C880162017C3686B18A3D4780
+
+###

input/day/16.http

@@ -0,0 +1,7 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-16
+Content-Type: text/plain
+
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
+
+###
+

input/day/17-example.http

@@ -0,0 +1,6 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-17
+Content-Type: text/plain
+
+target area: x=20..30, y=-10..-5
+
+###

input/day/17.http

@@ -0,0 +1,6 @@
+POST http://localhost:5001/advent-of-code-2021-911a8/europe-west1/day-17
+Content-Type: text/plain
+
+target area: x=48..70, y=-189..-148
+
+###