Added days 4 and 5

04a-jpaul.py

+from collections import defaultdict
+lines = open('04in.txt').read().split('\n')
+lines.sort()
+
+def parseTime(line):
+    words = line.split()
+    date, time = words[0][1:], words[1][:-1]
+    return int(time.split(':')[1])
+
+C = defaultdict(int)
+CM = defaultdict(int)
+guard = None
+asleep = None
+for line in lines:
+    if line:
+        time = parseTime(line)
+        if 'begins shift' in line:
+            guard = int(line.split()[3][1:])
+            asleep = None
+        elif 'falls asleep' in line:
+            asleep = time
+        elif 'wakes up' in line:
+            for t in range(asleep, time):
+                CM[(guard, t)] += 1
+                C[guard] += 1
+
+def argmax(d):
+    best = None
+    for k,v in d.items():
+        print("{}: {}".format(k,v))
+        if best is None or v > d[best]:
+            best = k
+    return best
+
+best_guard, best_min = argmax(CM)
+print (best_guard, best_min)
+
+print (best_guard * best_min)

04a.py

+import re
+
+def main(lines):
+	""" Sort the input by date/time, then find the best guard/minute combination
+
+		Note: the example answer is WRONG!
+	"""
+	# [1518-09-25 00:28] falls asleep
+	# Don't actually care about the year, since it's always the same
+	#							   grp1	 grp2	 grp3	 grp4	   grp5
+	pattern = re.compile("\[[0-9]+-([0-9]+)-([0-9]+) ([0-9]+):([0-9]+)\] (.+)")
+	guardptn = re.compile("Guard #([0-9]+) begins shift")
+
+	entries = []
+	guards = {}
+
+	for line in lines:
+		m = pattern.match(line)
+		g = guardptn.match(m.group(5))
+		guard = -1 if g == None else int(g.group(1))
+#						guard 	   # month			# day			 # hour			  # minute	   # activity
+		entries.append([guard, int(m.group(1)), int(m.group(2)), int(m.group(3)), int(m.group(4)), m.group(5)])
+	entries.sort(key = lambda x: (x[1], x[2], -x[3], x[4]))
+	for i in range(1, len(entries)):
+		if entries[i][0] == -1:
+			entries[i][0] = entries[i-1][0]
+	with open("04out.txt", "w") as ofile:
+		for entry in entries:
+			ofile.write("{}\n".format(entry))
+	# so entries is
+	#  [0,	     1,	     2,	   3,	  4,	   5]
+	#  #guard  # month  #day  #hour  #minute  #activity
+	stt = -1
+	end = -1
+	for i in range(1,len(entries)):
+		sleeping = False
+		cguard = entries[i][0]
+		#print(cguard)
+		if cguard == entries[i-1][0]:
+			if entries[i][5] == "falls asleep":
+				stt = entries[i][4]
+				#print("{} fell asleep at {}".format(cguard, stt))
+				sleeping = True
+			elif entries[i][5] == "wakes up":
+				end = entries[i][4]
+				sleeping = False
+				#print("{} woke up at {} (fell asleep at {})".format(cguard, end, stt))
+				for q in range(stt, end):
+					if cguard not in guards.keys():
+						guards[cguard] = {}
+						guards[cguard][q] = 1
+					else:
+						if q not in guards[cguard].keys():
+							guards[cguard][q] = 1
+						else:
+							guards[cguard][q] = guards[cguard][q] + 1
+		else:
+			stt = -1
+			end = -1
+
+	gslp = {}
+	for k,v in guards.items():
+		maxsleeps = 0
+		maxmin = 0
+		for minute, sleeps in v.items():
+			if sleeps > maxsleeps:
+				maxsleeps = sleeps
+				maxmin = minute
+		print("{} slept the most times ({}) at minute {}".format(k, maxsleeps, maxmin))
+		gslp[k] = [maxmin, maxsleeps]
+
+	tguard, tmin, tsleeps = 0, 0, 0
+	for k,v in gslp.items():
+		if v[1] > tsleeps:
+			tguard, tmin, tsleeps = k, v[0], v[1]
+
+	print("Guard {} slept the most times ({}) at minute {}. ID * minute = {}!".format(tguard, tsleeps, tmin, tguard*tmin))
+
+def add_sleeping(dct, mins):
+	pass
+
+if __name__ == "__main__":
+	lines = []
+	with open("04in.txt","r") as f:
+		for line in f:
+			lines.append(line.strip())
+	main(lines)

05a.py

+""" Advent of Code Day 5a
+
+"""
+
+def comp(s1,s2):
+	if (s1 != s2) and s1.lower() == s2.lower():
+		return True
+	return False
+
+def main(polymer):
+	opoly = polymer
+	do_it = True
+	while do_it:
+		olen = len(polymer)
+		print(olen)
+		for i in range(len(polymer)-1):
+			if comp(polymer[i], polymer[i+1]):
+				if i == 0: # the first two are a match
+					polymer = polymer[2:]
+				elif i == (olen - 2): # the last two are a match
+					polymer = polymer[:-2]
+				else: # the match is in the middle
+					polymer = polymer[:i] + polymer[i+2:]
+				break
+		if olen == len(polymer): # we didn't reduce polymer's length at all
+			do_it = False # no more matches, stop looping
+
+	print(len(polymer))
+
+
+if __name__ == "__main__":
+	inline = ""
+	with open("05in.txt","r") as ofile:
+		inline = ofile.read().strip()
+	main(inline)

05b.py

+""" Advent of Code Day 5b
+
+"""
+
+from collections import defaultdict
+
+def comp(s1,s2):
+	if (s1 != s2) and s1.lower() == s2.lower():
+		return True
+	return False
+
+def main(polymer):
+	opoly = polymer
+	lens = defaultdict(int)
+	alphabet = "abcdefghijklmnopqrstuvwxyz"
+	for char in alphabet:
+		polymer = "".join(opoly.split(char))
+		polymer = "".join(polymer.split(char.upper()))
+		do_it = True
+		while do_it:
+			olen = len(polymer)
+#			print(olen)
+			for acter in alphabet:
+				if acter != char:
+					polymer = "".join(polymer.split("{}{}".format(acter, acter.upper())))
+					polymer = "".join(polymer.split("{}{}".format(acter.upper(), acter)))
+					print("with {}, after {}, len(polymer) is {}".format(char, acter, len(polymer)))
+#			for i in range(len(polymer)-1):
+#				if comp(polymer[i], polymer[i+1]):
+#					if i == 0: # the first two are a match
+#						polymer = polymer[2:]
+#					elif i == (olen - 2): # the last two are a match
+#						polymer = polymer[:-2]
+#					else: # the match is in the middle
+#						polymer = polymer[:i] + polymer[i+2:]
+#					break
+			if olen == len(polymer): # we didn't reduce polymer's length at all
+				do_it = False # no more matches, stop looping
+		lens[char] = len(polymer)
+		with open("05out.txt","a") as ofile:
+			ofile.write("{}: {}\n".format(char, len(polymer)))
+	for k,v in lens.items():
+		print("{}: {}".format(k,v))
+
+
+if __name__ == "__main__":
+	inline = ""
+	with open("05in.txt","r") as ofile:
+		inline = ofile.read().strip()
+	main(inline)