Merge pull request #12 from lundgren2/day11

Add day 11 2020

Author: lundgren2

src/2020/_dayx/input renamed to src/2020/day00/input

@@ -0,0 +1,90 @@
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src/2020/_dayx/part1.ts renamed to src/2020/day00/part1.ts

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+const cloneSeats = (seats: string[][]) => JSON.parse(JSON.stringify(seats));
+
+const countOccupiedSeats = (seats: string[]) => {
+  return seats.reduce((acc, seat) => {
+    if (seat === '#') return acc + 1;
+    return acc;
+  }, 0);
+};
+
+const countAdjacentSeats = (seats: string[][], i: number, j: number) => {
+  const prevRow = seats[i - 1];
+  const nextRow = seats[i + 1];
+  const currentRow = seats[i];
+
+  return countOccupiedSeats([
+    prevRow && prevRow[j], // UP
+    nextRow && nextRow[j], // DOWN
+    currentRow[j - 1] && currentRow[j - 1], // LEFT
+    currentRow[j + 1] && currentRow[j + 1], // RIGHT
+    prevRow && prevRow[j - 1] && prevRow[j - 1], // UP LEFT
+    prevRow && prevRow[j + 1] && prevRow[j + 1], // UP RIGHT
+    nextRow && nextRow[j - 1] && nextRow[j - 1], // DOWN LEFT
+    nextRow && nextRow[j + 1] && nextRow[j + 1], // DOWN RIGHT
+  ]);
+};
+
+// const printSeats = (seats: string[][]) => {
+//   console.log(seats.map(seat => seat.join('').slice(0) + '\n').join(''));
+// };
+
+const updateSeats = (seats: string[][]): string[][] => {
+  const newSeats = cloneSeats(seats);
+  let seatChanged = false;
+
+  for (let i = 0; i < seats.length; i++) {
+    for (let j = 0; j < seats[0].length; j++) {
+      if (seats[i][j] === 'L') {
+        if (countAdjacentSeats(seats, i, j) === 0) {
+          newSeats[i][j] = '#';
+          seatChanged = true;
+        }
+      } else if (seats[i][j] === '#') {
+        if (countAdjacentSeats(seats, i, j) >= 4) {
+          newSeats[i][j] = 'L';
+          seatChanged = true;
+        }
+      }
+    }
+  }
+
+  seats = cloneSeats(newSeats);
+  // Update seats if state has changed
+  if (seatChanged) return updateSeats(seats);
+  return seats;
+};
+
+export const part1 = (input: string) => {
+  const seats = input.split('\n').map(a => a.split(''));
+  // printSeats(seats);
+  return countOccupiedSeats(updateSeats(seats).join(',').split(','));
+};

src/2020/_dayx/test.spec.ts renamed to src/2020/day00/test.spec.ts

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+const cloneSeats = (seats: string[][]) => JSON.parse(JSON.stringify(seats));
+
+const countOccupiedSeats = (seats: string[]) => {
+  return seats.reduce((acc, seat) => {
+    if (seat === '#') return acc + 1;
+    return acc;
+  }, 0);
+};
+
+type Directions = Record<string, number[]>;
+
+export const countAdjacentSeats = (seats: string[][], i: number, j: number) => {
+  const directions: Directions = {
+    UP: [0, -1],
+    DOWN: [0, 1],
+    LEFT: [-1, 0],
+    RIGHT: [1, 0],
+    UP_LEFT: [-1, -1],
+    UP_RIGHT: [1, -1],
+    DOWN_LEFT: [-1, 1],
+    DOWN_RIGHT: [1, 1],
+  };
+
+  return Object.keys(directions).reduce((count, direction) => {
+    const [stepX, stepY] = directions[direction];
+    let x = j + stepX;
+    let y = i + stepY;
+
+    while (x >= 0 && x < seats[0].length && y >= 0 && y < seats.length) {
+      if (seats[y][x] === 'L') return count;
+      else if (seats[y][x] === '#') return count + 1;
+      x += stepX;
+      y += stepY;
+    }
+    return count;
+  }, 0);
+};
+
+const updateSeats = (seats: string[][]): string[][] => {
+  const newSeats = cloneSeats(seats);
+  let seatChanged = false;
+  for (let i = 0; i < seats.length; i++) {
+    for (let j = 0; j < seats[0].length; j++) {
+      const currentSeat = seats[i][j];
+      if (currentSeat === '.') continue;
+      if (currentSeat === 'L') {
+        if (countAdjacentSeats(seats, i, j) === 0) {
+          newSeats[i][j] = '#';
+          seatChanged = true;
+        }
+      } else if (currentSeat === '#') {
+        if (countAdjacentSeats(seats, i, j) >= 5) {
+          newSeats[i][j] = 'L';
+          seatChanged = true;
+        }
+      }
+    }
+  }
+  // Update seats if state has changed
+  if (seatChanged) {
+    return updateSeats(cloneSeats(newSeats));
+  }
+  return seats;
+};
+
+export const part2 = (input: string) => {
+  const seats = input.split('\n').map(a => a.split(''));
+  return countOccupiedSeats(updateSeats(seats).join(',').split(','));
+};
+
+// const printSeats = (seats: string[][]) => {
+//   console.log(seats.map(seat => seat.join('').slice(0) + '\n').join(''));
+// };

src/2020/day11/input

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+import {readInput} from '../../utils';
+
+import {part1} from './part1';
+import {part2} from './part2';
+
+describe('Advent of Code 2020 - Day 11', () => {
+  let input: string;
+  let testInput: string;
+  beforeAll(async () => {
+    input = await readInput(__dirname + '/input');
+    testInput = await readInput(__dirname + '/test_input');
+  });
+
+  describe('part 1', () => {
+    it('should output 37 ', () => {
+      expect(part1(testInput)).toBe(37);
+    });
+
+    it('should output 2126 from input', () => {
+      expect(part1(input)).toBe(2126);
+    });
+  });
+
+  describe('part 2', () => {
+    it('should output 26 ', () => {
+      expect(part2(testInput)).toBe(26);
+    });
+
+    it('should output 1914 from input', () => {
+      expect(part2(input)).toBe(1914);
+    });
+  });
+});

src/2020/day11/part1.ts

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+L.LL.LL.LL
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+L.LL.LL.LL
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+..L.L.....
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