Day 5

5/input

@@ -0,0 +1,514 @@
+    [S] [C]         [Z]            
+[F] [J] [P]         [T]     [N]    
+[G] [H] [G] [Q]     [G]     [D]    
+[V] [V] [D] [G] [F] [D]     [V]    
+[R] [B] [F] [N] [N] [Q] [L] [S]    
+[J] [M] [M] [P] [H] [V] [B] [B] [D]
+[L] [P] [H] [D] [L] [F] [D] [J] [L]
+[D] [T] [V] [M] [J] [N] [F] [M] [G]
+ 1   2   3   4   5   6   7   8   9 
+
+move 3 from 4 to 6
+move 1 from 5 to 8
+move 3 from 7 to 3
+move 4 from 5 to 7
+move 1 from 7 to 8
+move 3 from 9 to 4
+move 2 from 8 to 2
+move 4 from 4 to 5
+move 2 from 5 to 1
+move 2 from 5 to 6
+move 7 from 8 to 1
+move 9 from 3 to 9
+move 11 from 6 to 5
+move 2 from 6 to 7
+move 12 from 1 to 4
+move 10 from 2 to 9
+move 2 from 3 to 9
+move 1 from 7 to 5
+move 4 from 7 to 6
+move 2 from 6 to 1
+move 5 from 1 to 6
+move 10 from 9 to 1
+move 9 from 9 to 8
+move 13 from 4 to 3
+move 7 from 6 to 2
+move 2 from 8 to 5
+move 9 from 3 to 9
+move 8 from 9 to 8
+move 4 from 8 to 4
+move 1 from 7 to 5
+move 3 from 9 to 1
+move 7 from 2 to 1
+move 1 from 3 to 1
+move 1 from 3 to 6
+move 1 from 6 to 1
+move 2 from 3 to 6
+move 5 from 4 to 1
+move 1 from 6 to 1
+move 3 from 8 to 7
+move 8 from 8 to 4
+move 3 from 5 to 4
+move 1 from 6 to 7
+move 1 from 5 to 8
+move 4 from 5 to 2
+move 7 from 5 to 8
+move 3 from 2 to 7
+move 7 from 4 to 8
+move 11 from 8 to 4
+move 15 from 4 to 1
+move 25 from 1 to 6
+move 4 from 8 to 7
+move 1 from 2 to 4
+move 11 from 6 to 4
+move 12 from 6 to 3
+move 1 from 1 to 9
+move 1 from 9 to 8
+move 16 from 1 to 3
+move 1 from 8 to 7
+move 12 from 4 to 6
+move 9 from 6 to 5
+move 3 from 6 to 5
+move 6 from 7 to 5
+move 3 from 3 to 5
+move 2 from 6 to 3
+move 11 from 5 to 8
+move 2 from 8 to 3
+move 2 from 1 to 4
+move 7 from 3 to 1
+move 2 from 4 to 6
+move 2 from 6 to 2
+move 5 from 7 to 3
+move 1 from 1 to 6
+move 1 from 1 to 8
+move 2 from 2 to 5
+move 1 from 7 to 4
+move 1 from 1 to 2
+move 10 from 3 to 5
+move 11 from 3 to 6
+move 1 from 4 to 9
+move 1 from 9 to 4
+move 1 from 4 to 2
+move 2 from 5 to 9
+move 2 from 2 to 8
+move 2 from 1 to 6
+move 2 from 1 to 2
+move 2 from 3 to 6
+move 3 from 8 to 1
+move 3 from 1 to 4
+move 7 from 8 to 3
+move 2 from 9 to 5
+move 2 from 4 to 9
+move 7 from 5 to 6
+move 2 from 8 to 6
+move 1 from 4 to 8
+move 2 from 2 to 4
+move 21 from 6 to 3
+move 10 from 5 to 7
+move 7 from 7 to 6
+move 1 from 9 to 3
+move 1 from 4 to 9
+move 1 from 9 to 4
+move 1 from 8 to 4
+move 8 from 6 to 4
+move 1 from 4 to 5
+move 1 from 5 to 8
+move 4 from 3 to 6
+move 1 from 8 to 2
+move 1 from 4 to 2
+move 2 from 7 to 3
+move 2 from 2 to 7
+move 22 from 3 to 5
+move 4 from 6 to 2
+move 2 from 6 to 9
+move 7 from 3 to 9
+move 6 from 9 to 1
+move 18 from 5 to 3
+move 2 from 5 to 4
+move 20 from 3 to 5
+move 3 from 7 to 3
+move 5 from 1 to 2
+move 11 from 5 to 7
+move 1 from 1 to 7
+move 3 from 9 to 3
+move 16 from 5 to 8
+move 7 from 8 to 7
+move 1 from 9 to 2
+move 8 from 2 to 3
+move 2 from 2 to 4
+move 3 from 3 to 1
+move 9 from 3 to 8
+move 1 from 6 to 3
+move 9 from 7 to 3
+move 3 from 1 to 8
+move 1 from 7 to 9
+move 1 from 9 to 4
+move 1 from 7 to 5
+move 10 from 4 to 5
+move 2 from 4 to 2
+move 19 from 8 to 5
+move 1 from 8 to 3
+move 4 from 3 to 5
+move 2 from 4 to 8
+move 4 from 7 to 8
+move 4 from 3 to 9
+move 4 from 7 to 6
+move 2 from 2 to 5
+move 2 from 3 to 2
+move 6 from 8 to 7
+move 1 from 8 to 4
+move 2 from 6 to 4
+move 3 from 4 to 8
+move 3 from 9 to 2
+move 4 from 7 to 8
+move 28 from 5 to 8
+move 16 from 8 to 4
+move 11 from 8 to 4
+move 3 from 3 to 4
+move 7 from 5 to 8
+move 13 from 8 to 7
+move 1 from 5 to 6
+move 1 from 6 to 7
+move 1 from 9 to 2
+move 2 from 6 to 2
+move 12 from 4 to 9
+move 4 from 4 to 1
+move 2 from 9 to 8
+move 4 from 8 to 3
+move 3 from 4 to 5
+move 4 from 4 to 1
+move 4 from 4 to 7
+move 3 from 7 to 9
+move 5 from 9 to 7
+move 7 from 2 to 3
+move 1 from 5 to 7
+move 8 from 1 to 5
+move 1 from 2 to 4
+move 11 from 3 to 1
+move 10 from 5 to 3
+move 3 from 9 to 1
+move 3 from 9 to 6
+move 5 from 1 to 6
+move 7 from 6 to 9
+move 8 from 9 to 7
+move 9 from 3 to 4
+move 1 from 6 to 9
+move 8 from 7 to 1
+move 9 from 4 to 2
+move 2 from 1 to 6
+move 3 from 2 to 6
+move 4 from 4 to 6
+move 2 from 9 to 8
+move 2 from 1 to 2
+move 1 from 3 to 8
+move 2 from 8 to 4
+move 1 from 6 to 8
+move 11 from 1 to 6
+move 1 from 1 to 5
+move 3 from 2 to 9
+move 2 from 9 to 3
+move 1 from 1 to 7
+move 2 from 4 to 9
+move 4 from 2 to 9
+move 2 from 8 to 5
+move 10 from 6 to 1
+move 2 from 5 to 6
+move 5 from 9 to 8
+move 5 from 8 to 7
+move 1 from 2 to 1
+move 7 from 1 to 2
+move 2 from 9 to 4
+move 1 from 3 to 5
+move 15 from 7 to 2
+move 8 from 6 to 3
+move 2 from 4 to 3
+move 2 from 6 to 4
+move 4 from 7 to 1
+move 4 from 7 to 5
+move 1 from 6 to 4
+move 3 from 1 to 7
+move 5 from 7 to 6
+move 4 from 7 to 5
+move 18 from 2 to 4
+move 5 from 6 to 4
+move 4 from 1 to 2
+move 8 from 3 to 8
+move 2 from 8 to 4
+move 2 from 3 to 7
+move 1 from 5 to 7
+move 3 from 8 to 4
+move 2 from 7 to 2
+move 1 from 3 to 8
+move 9 from 2 to 6
+move 2 from 8 to 6
+move 1 from 7 to 3
+move 1 from 3 to 5
+move 3 from 6 to 8
+move 1 from 8 to 5
+move 1 from 5 to 9
+move 1 from 1 to 2
+move 5 from 4 to 6
+move 10 from 6 to 2
+move 5 from 2 to 6
+move 5 from 6 to 4
+move 1 from 6 to 3
+move 6 from 4 to 6
+move 3 from 2 to 6
+move 2 from 2 to 3
+move 11 from 4 to 6
+move 1 from 9 to 5
+move 4 from 6 to 7
+move 1 from 4 to 3
+move 12 from 4 to 3
+move 1 from 8 to 6
+move 9 from 5 to 7
+move 1 from 5 to 2
+move 1 from 8 to 5
+move 1 from 4 to 9
+move 9 from 7 to 9
+move 1 from 3 to 4
+move 2 from 3 to 6
+move 2 from 5 to 6
+move 2 from 8 to 5
+move 11 from 3 to 4
+move 2 from 3 to 1
+move 1 from 2 to 3
+move 1 from 3 to 8
+move 3 from 7 to 9
+move 5 from 4 to 2
+move 2 from 5 to 8
+move 6 from 4 to 2
+move 1 from 1 to 3
+move 12 from 9 to 1
+move 6 from 1 to 6
+move 1 from 8 to 4
+move 1 from 8 to 3
+move 5 from 2 to 7
+move 2 from 3 to 9
+move 5 from 7 to 1
+move 1 from 7 to 5
+move 2 from 9 to 1
+move 14 from 1 to 7
+move 2 from 4 to 7
+move 7 from 2 to 4
+move 1 from 2 to 1
+move 1 from 1 to 3
+move 1 from 5 to 4
+move 1 from 9 to 6
+move 16 from 6 to 5
+move 2 from 5 to 4
+move 12 from 6 to 8
+move 10 from 4 to 8
+move 9 from 7 to 3
+move 4 from 7 to 6
+move 11 from 5 to 8
+move 2 from 5 to 2
+move 14 from 8 to 9
+move 1 from 5 to 1
+move 3 from 9 to 4
+move 2 from 2 to 1
+move 7 from 8 to 3
+move 6 from 3 to 5
+move 8 from 9 to 8
+move 1 from 6 to 1
+move 1 from 4 to 2
+move 4 from 3 to 8
+move 1 from 7 to 2
+move 3 from 1 to 5
+move 2 from 5 to 7
+move 3 from 9 to 2
+move 1 from 1 to 8
+move 5 from 5 to 4
+move 2 from 7 to 8
+move 4 from 2 to 5
+move 1 from 2 to 4
+move 2 from 7 to 8
+move 4 from 6 to 2
+move 6 from 5 to 3
+move 1 from 6 to 5
+move 1 from 5 to 3
+move 1 from 3 to 8
+move 8 from 8 to 3
+move 9 from 8 to 5
+move 9 from 8 to 2
+move 2 from 8 to 9
+move 2 from 3 to 8
+move 5 from 5 to 8
+move 1 from 3 to 7
+move 2 from 9 to 5
+move 7 from 2 to 4
+move 14 from 4 to 6
+move 2 from 2 to 7
+move 1 from 7 to 3
+move 1 from 7 to 9
+move 3 from 5 to 2
+move 1 from 7 to 1
+move 3 from 2 to 4
+move 7 from 8 to 2
+move 3 from 6 to 1
+move 17 from 3 to 1
+move 2 from 8 to 3
+move 6 from 2 to 7
+move 2 from 7 to 9
+move 3 from 6 to 8
+move 2 from 8 to 6
+move 4 from 2 to 1
+move 3 from 4 to 7
+move 1 from 8 to 7
+move 1 from 8 to 9
+move 1 from 4 to 2
+move 3 from 5 to 7
+move 2 from 3 to 1
+move 2 from 3 to 5
+move 5 from 7 to 4
+move 5 from 7 to 3
+move 1 from 4 to 8
+move 3 from 3 to 1
+move 6 from 1 to 3
+move 1 from 7 to 5
+move 2 from 9 to 2
+move 3 from 5 to 8
+move 1 from 8 to 1
+move 8 from 3 to 5
+move 1 from 4 to 9
+move 3 from 6 to 5
+move 3 from 6 to 3
+move 2 from 3 to 7
+move 1 from 4 to 7
+move 3 from 6 to 4
+move 2 from 7 to 2
+move 1 from 7 to 8
+move 2 from 5 to 4
+move 1 from 6 to 1
+move 7 from 4 to 7
+move 7 from 5 to 2
+move 10 from 2 to 3
+move 3 from 2 to 6
+move 3 from 8 to 1
+move 1 from 8 to 7
+move 2 from 6 to 3
+move 1 from 6 to 9
+move 4 from 7 to 5
+move 16 from 1 to 5
+move 1 from 9 to 7
+move 3 from 7 to 6
+move 11 from 5 to 6
+move 2 from 7 to 9
+move 12 from 6 to 4
+move 2 from 6 to 9
+move 6 from 3 to 2
+move 1 from 5 to 7
+move 5 from 9 to 5
+move 1 from 9 to 6
+move 4 from 3 to 7
+move 1 from 4 to 2
+move 7 from 2 to 5
+move 3 from 5 to 2
+move 6 from 5 to 6
+move 3 from 2 to 6
+move 9 from 6 to 8
+move 5 from 5 to 9
+move 5 from 7 to 1
+move 4 from 1 to 9
+move 2 from 9 to 4
+move 1 from 6 to 7
+move 9 from 4 to 1
+move 7 from 5 to 9
+move 18 from 1 to 3
+move 9 from 9 to 5
+move 8 from 8 to 2
+move 1 from 2 to 5
+move 4 from 2 to 3
+move 4 from 9 to 6
+move 1 from 4 to 8
+move 2 from 5 to 7
+move 2 from 9 to 2
+move 10 from 3 to 9
+move 5 from 5 to 9
+move 1 from 7 to 2
+move 2 from 8 to 7
+move 2 from 3 to 5
+move 2 from 9 to 1
+move 2 from 7 to 3
+move 1 from 2 to 1
+move 5 from 5 to 8
+move 1 from 2 to 1
+move 15 from 3 to 6
+move 1 from 7 to 6
+move 10 from 6 to 5
+move 1 from 7 to 8
+move 4 from 1 to 6
+move 1 from 8 to 3
+move 2 from 1 to 5
+move 3 from 8 to 1
+move 1 from 4 to 6
+move 1 from 4 to 2
+move 4 from 9 to 7
+move 6 from 5 to 7
+move 3 from 1 to 9
+move 10 from 6 to 8
+move 2 from 1 to 3
+move 8 from 7 to 9
+move 1 from 9 to 6
+move 2 from 7 to 9
+move 3 from 3 to 5
+move 1 from 2 to 6
+move 2 from 6 to 5
+move 5 from 9 to 4
+move 4 from 8 to 2
+move 1 from 1 to 3
+move 4 from 5 to 9
+move 3 from 6 to 1
+move 2 from 1 to 5
+move 3 from 5 to 2
+move 8 from 8 to 3
+move 11 from 9 to 4
+move 13 from 4 to 8
+move 2 from 9 to 2
+move 2 from 3 to 1
+move 1 from 4 to 1
+move 1 from 3 to 8
+move 2 from 6 to 9
+move 7 from 8 to 1
+move 3 from 2 to 5
+move 7 from 2 to 5
+move 3 from 4 to 6
+move 4 from 9 to 2
+move 2 from 3 to 5
+move 9 from 5 to 6
+move 5 from 2 to 7
+move 2 from 9 to 2
+move 2 from 9 to 7
+move 12 from 6 to 8
+move 5 from 5 to 7
+move 1 from 9 to 8
+move 3 from 1 to 6
+move 5 from 5 to 8
+move 6 from 1 to 9
+move 2 from 1 to 5
+move 1 from 6 to 9
+move 5 from 9 to 7
+move 2 from 5 to 8
+move 11 from 7 to 6
+move 20 from 8 to 1
+move 2 from 9 to 8
+move 4 from 7 to 6
+move 6 from 8 to 3
+move 13 from 6 to 9
+move 4 from 3 to 2
+move 4 from 6 to 3
+move 2 from 3 to 6
+move 5 from 9 to 8
+move 2 from 7 to 1
+move 2 from 6 to 9
+move 6 from 8 to 3
+move 6 from 3 to 6
+move 5 from 2 to 9
+move 22 from 1 to 3
+move 3 from 2 to 1
+move 5 from 9 to 3
+move 1 from 1 to 6
+move 3 from 6 to 2
+move 1 from 2 to 4
+move 33 from 3 to 5
+move 1 from 8 to 7

5/solution.mjs

@@ -0,0 +1,154 @@
+import { readFileSync } from 'node:fs';
+
+const input = readFileSync('input', 'utf-8');
+
+const [stackInput, movementInput] = input.split('\n\n', 2);
+
+// Parse movements
+const movements = movementInput
+  .split('\n')
+  .filter(movement => movement)
+  .map(movement => {
+    const match = movement.match(/move (\d+) from (\d+) to (\d+)/);
+    if (!match) {
+      throw new Error(`Invalid movement: ${movement}`);
+    }
+    return {
+      count: parseInt(match[1]),
+      from: parseInt(match[2]),
+      to: parseInt(match[3])
+    }
+  });
+
+// Parse stacks
+const stackInputLines = stackInput.split('\n');
+const columnDelimiter = ' ';
+const columnPositions = stackInputLines
+  // Locate delimiter positions
+  .map(line => {
+    const positions = [];
+    let pos = -1;
+    while (true) {
+      pos = line.indexOf(columnDelimiter, pos + 1);
+      if (pos === -1) {
+        break;
+      }
+      positions.push(pos);
+    }
+
+    return positions;
+  })
+  .reduce((commonPositions, positions) =>
+    commonPositions.filter(
+      pos => positions.includes(pos)
+    )
+  );
+
+const columns = new Array(columnPositions.length + 1)
+  .fill(0)
+  .map(column => []);
+
+for (const line of [...stackInputLines].reverse()) {
+  for (let i = 0; i <= columnPositions.length; i++) {
+    const start = (columnPositions[i - 1] ?? -1) + 1;
+    const end = columnPositions[i] ?? line.length;
+    const value = line.slice(start, end);
+    columns[i].push(value);
+  }
+}
+
+class Stack {
+  constructor(number, crates) {
+    this.number = number;
+    this.crates = crates;
+  }
+
+  get topCrate() {
+    return this.crates[this.crates.length - 1];
+  }
+
+  move(count, toStack) {
+    this._checkMoveCount(count);
+    toStack.crates.push(...this.crates.splice(-count));
+  }
+
+  moveIndividually(count, toStack) {
+    this._checkMoveCount(count);
+    toStack.crates.push(...this.crates.splice(-count).reverse());
+  }
+
+  _checkMoveCount(count) {
+    if (count > this.crates.length) {
+      throw new Error(
+        `Tried to move ${count} crates from a stack containing: ` +
+        `${this.crates.length}`
+      );
+    }
+  }
+}
+
+function buildStacks() {
+  return new Map(columns
+    .map(column => column
+      .map(cell => cell.trim())
+      .filter(cell => cell)
+    )
+    .map(column => {
+      if (column.length < 1) {
+        throw new Error('Invalid column');
+      }
+
+      const number = parseInt(column[0]);
+      if (isNaN(number)) {
+        throw new Error(`Invalid column number: ${number}`);
+      }
+
+      const crates = column
+        .slice(1)
+        .map(crate => crate.replaceAll(/\[?\]?/g, ''));
+
+      return new Stack(number, crates);
+    })
+    .map(stack => [stack.number, stack])
+  );
+}
+
+function getTopCrates(stacks) {
+  return [...stacks.keys()]
+    .sort()
+    .map(number => stacks.get(number).topCrate)
+    .reduce((crates, crate) => crates + crate);
+}
+
+function runSimulation(simulationCb) {
+  for (const movement of movements) {
+    const fromStack = stacks.get(movement.from);
+    if (!fromStack) {
+      throw new Error(`Tried to move from unknown stack: ${movement.from}`);
+    }
+    const toStack = stacks.get(movement.to);
+    if (!toStack) {
+      throw new Error(`Tried to move to unknown stack: ${movement.to}`);
+    }
+    simulationCb(movement.count, fromStack, toStack);
+  }
+}
+
+let stacks;
+let topCrates;
+
+// CrateMover 9000 Simulation
+stacks = buildStacks();
+runSimulation((count, fromStack, toStack) =>
+  fromStack.moveIndividually(count, toStack)
+);
+topCrates = getTopCrates(stacks);
+console.log(`Top crates after CrateMover 9000 sort: ${topCrates}`);
+
+// CrateMover 9001 Simulation
+stacks = buildStacks();
+runSimulation((count, fromStack, toStack) =>
+  fromStack.move(count, toStack)
+);
+topCrates = getTopCrates(stacks);
+console.log(`Top crates after CrateMover 9001 sort: ${topCrates}`);