2022 Day 15 Python

2022/day15.py

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+from helpers import *
+lines = read_day(15).split('\n')
+sample_lines = '''
+Sensor at x=2, y=18: closest beacon is at x=-2, y=15
+Sensor at x=9, y=16: closest beacon is at x=10, y=16
+Sensor at x=13, y=2: closest beacon is at x=15, y=3
+Sensor at x=12, y=14: closest beacon is at x=10, y=16
+Sensor at x=10, y=20: closest beacon is at x=10, y=16
+Sensor at x=14, y=17: closest beacon is at x=10, y=16
+Sensor at x=8, y=7: closest beacon is at x=2, y=10
+Sensor at x=2, y=0: closest beacon is at x=2, y=10
+Sensor at x=0, y=11: closest beacon is at x=2, y=10
+Sensor at x=20, y=14: closest beacon is at x=25, y=17
+Sensor at x=17, y=20: closest beacon is at x=21, y=22
+Sensor at x=16, y=7: closest beacon is at x=15, y=3
+Sensor at x=14, y=3: closest beacon is at x=15, y=3
+Sensor at x=20, y=1: closest beacon is at x=15, y=3
+'''.strip().split('\n')
+
+def do_sensors(lines: list[str], row: int):
+	seen_cells_on_row = set()
+	for line in lines:
+		x, y, nx, ny = line_to_numbers(line)
+		distance = abs(x-nx) + abs(y-ny)
+		dr = abs(y-row)
+		if dr < distance:
+			d2 = distance - dr
+			seen_cells_on_row |= {x+i for i in range(-d2, d2+1)}
+	print(f'Part 1: {len(seen_cells_on_row) - 1}')
+# do_sensors(sample_lines, 20)
+do_sensors(lines, 2_000_000)
+
+def in_range_of_sensors(sensors, x, y):
+	for (i,j,d) in sensors:
+		if abs(x-i) + abs(y-j) <= d:
+			d2 = d - abs(x-i)
+			y_advance = (j+d2)-y + 1
+			return y_advance
+	return False
+
+def do_sensors_2(lines: list[str], search_space: int):
+	sensors = []
+	for num, line in enumerate(lines, 1):
+		x, y, nx, ny = line_to_numbers(line)
+		if not ((0 <= x <= 4_000_000) and (0 <= y <= 4_000_000)):
+			continue
+		distance = abs(x-nx) + abs(y-ny)
+		sensors.append((x, y, distance))
+
+	# print(sensors)
+	for x in range(0, search_space+1):
+		# if x % 100_000 == 0:
+		# 	print(f'Processed {x} rows')
+		y = 0
+		while y <= search_space:
+			y_skip = in_range_of_sensors(sensors, x, y)
+			if y_skip is False:
+				print(f'Part 2: Seen at ({x},{y}) = submit {x*4000000 + y}')
+				return
+			y += y_skip
+
+# do_sensors_2(sample_lines, 20)
+do_sensors_2(lines, 4_000_000)
+

2022/input/15

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+Sensor at x=193758, y=2220950: closest beacon is at x=652350, y=2000000
+Sensor at x=3395706, y=3633894: closest beacon is at x=3404471, y=3632467
+Sensor at x=3896022, y=3773818: closest beacon is at x=3404471, y=3632467
+Sensor at x=1442554, y=1608100: closest beacon is at x=652350, y=2000000
+Sensor at x=803094, y=813675: closest beacon is at x=571163, y=397470
+Sensor at x=3491072, y=3408908: closest beacon is at x=3404471, y=3632467
+Sensor at x=1405010, y=486446: closest beacon is at x=571163, y=397470
+Sensor at x=3369963, y=3641076: closest beacon is at x=3404471, y=3632467
+Sensor at x=3778742, y=2914974: closest beacon is at x=4229371, y=3237483
+Sensor at x=1024246, y=3626229: closest beacon is at x=2645627, y=3363491
+Sensor at x=3937091, y=2143160: closest beacon is at x=4229371, y=3237483
+Sensor at x=2546325, y=2012887: closest beacon is at x=2645627, y=3363491
+Sensor at x=3505386, y=3962087: closest beacon is at x=3404471, y=3632467
+Sensor at x=819467, y=239010: closest beacon is at x=571163, y=397470
+Sensor at x=2650614, y=595151: closest beacon is at x=3367919, y=-1258
+Sensor at x=3502942, y=6438: closest beacon is at x=3367919, y=-1258
+Sensor at x=3924022, y=634379: closest beacon is at x=3367919, y=-1258
+Sensor at x=2935977, y=2838245: closest beacon is at x=2645627, y=3363491
+Sensor at x=1897626, y=7510: closest beacon is at x=3367919, y=-1258
+Sensor at x=151527, y=640680: closest beacon is at x=571163, y=397470
+Sensor at x=433246, y=1337298: closest beacon is at x=652350, y=2000000
+Sensor at x=2852855, y=3976978: closest beacon is at x=3282750, y=3686146
+Sensor at x=3328398, y=3645875: closest beacon is at x=3282750, y=3686146
+Sensor at x=3138934, y=3439134: closest beacon is at x=3282750, y=3686146
+Sensor at x=178, y=2765639: closest beacon is at x=652350, y=2000000
+Sensor at x=3386231, y=3635056: closest beacon is at x=3404471, y=3632467
+Sensor at x=3328074, y=1273456: closest beacon is at x=3367919, y=-1258
+Sensor at x=268657, y=162438: closest beacon is at x=571163, y=397470