solve 2020 d11 and d12

data/2020/11.txt

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data/2020/12.txt

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+E2
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+F95

solutions/2020/11.js

@@ -0,0 +1,132 @@
+const { Glib, Vector, twodee } = require('../../lib');
+
+const STATE = {
+  EMPTY: 'L',
+  FLOOR: '.',
+  OCCUPIED: '#',
+  NONE: 'X',
+};
+
+const step1 = (input) => {
+  let changes = 0n;
+
+  const output = input.glibEntries
+    .map(([pts, state]) => {
+      switch (state) {
+        case STATE.EMPTY:
+          if (
+            Vector.fromString(pts)
+              .neighbors()
+              .map((pt) => pt.string)
+              .lookupInMap(input, true)
+              .filter((neighborState) => neighborState === STATE.OCCUPIED)
+              .length === 0n
+          ) {
+            changes++;
+            return [pts, STATE.OCCUPIED];
+          }
+          return [pts, STATE.EMPTY];
+        case STATE.OCCUPIED:
+          if (
+            Vector.fromString(pts)
+              .neighbors()
+              .map((pt) => pt.string)
+              .lookupInMap(input, true)
+              .filter((neighborState) => neighborState === STATE.OCCUPIED)
+              .length >= 4n
+          ) {
+            changes++;
+            return [pts, STATE.EMPTY];
+          }
+          return [pts, STATE.OCCUPIED];
+        case STATE.FLOOR:
+          return [pts, STATE.FLOOR];
+        default:
+          console.log(pts, state);
+          throw new Error('invalid state');
+      }
+    })
+    .toMap();
+
+  return [output, changes];
+};
+
+const visibleNeighbor = (point, direction, state) => {
+  let next = point.add(direction);
+  while (true) {
+    const nextString = next.string;
+    if (!state.has(nextString)) {
+      return state.NONE;
+    }
+    const found = state.get(nextString);
+    if (found !== STATE.FLOOR) {
+      return found;
+    }
+    next = next.add(direction);
+  }
+};
+
+const step2 = (input) => {
+  let changes = 0n;
+
+  const output = input.glibEntries
+    .map(([pts, state]) => {
+      const pt = Vector.fromString(pts);
+      switch (state) {
+        case STATE.EMPTY:
+          if (
+            twodee.ORIGIN.neighbors()
+              .map((direction) => visibleNeighbor(pt, direction, input))
+              .filter((neighborState) => neighborState === STATE.OCCUPIED)
+              .length === 0n
+          ) {
+            changes++;
+            return [pts, STATE.OCCUPIED];
+          }
+          return [pts, STATE.EMPTY];
+        case STATE.OCCUPIED:
+          if (
+            twodee.ORIGIN.neighbors()
+              .map((direction) => visibleNeighbor(pt, direction, input))
+              .filter((neighborState) => neighborState === STATE.OCCUPIED)
+              .length >= 5n
+          ) {
+            changes++;
+            return [pts, STATE.EMPTY];
+          }
+          return [pts, STATE.OCCUPIED];
+        case STATE.FLOOR:
+          return [pts, STATE.FLOOR];
+        default:
+          console.log(pts, state);
+          throw new Error('invalid state');
+      }
+    })
+    .toMap();
+
+  return [output, changes];
+};
+
+const solve = (input, stepFn) => {
+  let state = Glib.fromLines(input)
+    .flatMap((line, y) =>
+      Glib.fromIterable(line).map((cell, x) => [new Vector(x, y).string, cell]),
+    )
+    .toMap();
+
+  // only run 1k iterations, it's a fairly simple automota
+  // I wonder it it's possible to make a glider...
+  for (let i = 0n; i < 1000n; i++) {
+    const [newState, changes] = stepFn(state);
+    if (changes === 0n) {
+      return state.glibValues.filter((e) => e === STATE.OCCUPIED).length;
+    }
+    state = newState;
+  }
+  throw new Error('too many iterations');
+};
+
+module.exports = {
+  1: (input) => solve(input, step1),
+  2: (input) => solve(input, step2),
+};

solutions/2020/12.js

@@ -0,0 +1,122 @@
+const { Glib, Vector, twodee } = require('../../lib');
+
+const LEFT = new Map([
+  [twodee.DIRECTIONS.UP.string, twodee.DIRECTIONS.LEFT],
+  [twodee.DIRECTIONS.LEFT.string, twodee.DIRECTIONS.DOWN],
+  [twodee.DIRECTIONS.DOWN.string, twodee.DIRECTIONS.RIGHT],
+  [twodee.DIRECTIONS.RIGHT.string, twodee.DIRECTIONS.UP],
+]);
+
+const RIGHT = new Map([
+  [twodee.DIRECTIONS.UP.string, twodee.DIRECTIONS.RIGHT],
+  [twodee.DIRECTIONS.RIGHT.string, twodee.DIRECTIONS.DOWN],
+  [twodee.DIRECTIONS.DOWN.string, twodee.DIRECTIONS.LEFT],
+  [twodee.DIRECTIONS.LEFT.string, twodee.DIRECTIONS.UP],
+]);
+
+const INSTRUCTIONS1 = {
+  N: (count, state) => {
+    return {
+      ...state,
+      location: state.location.add(twodee.DIRECTIONS.UP.multiply(count)),
+    };
+  },
+  S: (count, state) => {
+    return {
+      ...state,
+      location: state.location.add(twodee.DIRECTIONS.DOWN.multiply(count)),
+    };
+  },
+  E: (count, state) => {
+    return {
+      ...state,
+      location: state.location.add(twodee.DIRECTIONS.RIGHT.multiply(count)),
+    };
+  },
+  W: (count, state) => {
+    return {
+      ...state,
+      location: state.location.add(twodee.DIRECTIONS.LEFT.multiply(count)),
+    };
+  },
+  F: (count, state) => {
+    return {
+      ...state,
+      location: state.location.add(state.direction.multiply(count)),
+    };
+  },
+  L: (count, state) => {
+    let direction = state.direction;
+    for (let i = 0; i < count; i += 90) {
+      direction = LEFT.get(direction.string);
+    }
+    return {
+      ...state,
+      direction,
+    };
+  },
+  R: (count, state) => {
+    let direction = state.direction;
+    for (let i = 0; i < count; i += 90) {
+      direction = RIGHT.get(direction.string);
+    }
+    return {
+      ...state,
+      direction,
+    };
+  },
+};
+
+const INSTRUCTIONS2 = {
+  ...INSTRUCTIONS1,
+  F: (count, state) => {
+    return {
+      ...state,
+      ship: state.ship.add(state.location.multiply(count)),
+    };
+  },
+  // todo: (soon) implement a matrix library so this gets better
+  L: (count, state) => {
+    let location = state.location;
+    for (let i = 0; i < count; i += 90) {
+      location = new Vector(-location.v[1], location.v[0]);
+    }
+    return {
+      ...state,
+      location,
+    };
+  },
+  R: (count, state) => {
+    let location = state.location;
+    for (let i = 0; i < count; i += 90) {
+      location = new Vector(location.v[1], -location.v[0]);
+    }
+    return {
+      ...state,
+      location,
+    };
+  },
+};
+
+const solve = (input, ops, start = twodee.ORIGIN) =>
+  Glib.fromLines(input, ops)
+    .map(([instruction, ...number]) => ({
+      instruction,
+      count: BigInt(number.join('')),
+    }))
+    .reduce(
+      (state, { instruction, count }) => {
+        return ops[instruction](count, state);
+      },
+      {
+        location: start,
+        direction: twodee.DIRECTIONS.RIGHT,
+        ship: twodee.ORIGIN,
+      },
+    );
+
+module.exports = {
+  1: (input) => solve(input, INSTRUCTIONS1).location.distance(twodee.ORIGIN),
+  2: (input) =>
+    solve(input, INSTRUCTIONS2, new Vector(10, 1)).ship.distance(twodee.ORIGIN),
+};

testAll.js

@@ -12,6 +12,8 @@ const results = {
     8: [1553, 1877],
     9: [1721308972, 209694133],
     10: [2277, 37024595836928],
+    11: [2359, 2131],
+    12: [508, 30761],
   },
   2019: {
     1: [3386686, 5077155],