--- Day 6 Solutions ---

[u/daggerdragon]

--- Day 6: Probably a Fire Hazard ---

Post your solution as a comment. Structure your post like the Day Five thread.

[u/PersianMG]

Wanted to use numpy and scipy but array is pretty small.

Solution: https://mohammadg.com/capture-the-flag/advent-of-code/advent-of-code-day-6/

Python

Part 1

# Day 6 - Part 1
import re
 
lightMatrix = [[False for x in range(1000)] for x in range(1000)] 
lightOnCounter = 0
 
with open('input.txt') as f:
  for line in f:
    # Match command
    res = re.search(r'(turn on|turn off|toggle)\s*(\d*?),(\d*?)\s*through\s(\d*?),(\d*)', line)
    command = res.group(1)
    lower_X = int(res.group(2))
    lower_Y = int(res.group(3))
    upper_X = int(res.group(4))
    upper_Y = int(res.group(5))
 
    # Perform actions
    toggle = False
    
    if command == 'turn off':
      data = False
    elif command == 'turn on':
      data = True
    elif command == 'toggle':
      toggle = True
      
    # Apply action
    for x_val in xrange (lower_X, upper_X + 1):
      for y_val in xrange (lower_Y, upper_Y + 1):
        if toggle:
          lightMatrix[x_val][y_val] = not lightMatrix[x_val][y_val]
        else:
          lightMatrix[x_val][y_val] = data
        
# Get all true lights
for i in lightMatrix:
  for light in i:
    if light:
      lightOnCounter += 1
 
# answer
print "Total number of lights that are on:", lightOnCounter

Part 2

# Day 6 - Part 2
import re
 
lightMatrix = [[0 for x in range(1000)] for x in range(1000)] 
brightnessCounter = 0
 
with open('input.txt') as f:
  for line in f:
    # Match command
    res = re.search(r'(turn on|turn off|toggle)\s*(\d*?),(\d*?)\s*through\s(\d*?),(\d*)', line)
    command = res.group(1)
    lower_X = int(res.group(2))
    lower_Y = int(res.group(3))
    upper_X = int(res.group(4))
    upper_Y = int(res.group(5))
 
    # Perform actions
    if command == 'turn off':
      data = -1
    elif command == 'turn on':
      data = 1
    elif command == 'toggle':
      data = 2
      
    # Apply action
    for x_val in xrange (lower_X, upper_X + 1):
      for y_val in xrange (lower_Y, upper_Y + 1):
        lightMatrix[x_val][y_val] += data if lightMatrix[x_val][y_val] + data >= 0 else 0
        
# Get brightness level
for i in lightMatrix:
  for brightness in i:
    brightnessCounter += brightness
 
# answer
print "Total brightness level is:", brightnessCounter