Merge branch 'day2' of noelle/adventofcode2025 into master

day2-1.py

@@ -0,0 +1,39 @@
+# encoding: utf-8
+
+# Given a list of comma-separated pairs of numbers separated by a dash
+# e.g. 111-999,22-33
+# find all the numbers that are some sequence of digits repeated twice
+import logging
+
+logger = logging.Logger(__name__)
+logger.addHandler(logging.StreamHandler())
+logger.setLevel(logging.DEBUG)
+
+def main():
+    with open("day2_input.txt", "r") as f:
+        input_line = f.readline().strip()
+    inranges = [x.strip() for x in input_line.split(",")]
+    num_ranges = len(inranges)
+    tenths = num_ranges//10
+    logger.debug(f"Received {num_ranges} ranges.")
+    all_invalids = []
+    for i, r in enumerate(inranges):
+        if tenths and i % tenths == 0:
+            logger.debug(f"Processing range {i}.")
+        x, y = [int(q) for q in r.strip().split("-")]
+        invalids = []
+        for k in range(x,y+1):
+            s_k = str(k)
+            l = len(s_k)
+            m = l//2
+            if l % 2 == 0:
+                if s_k[:m] == s_k[m:]:
+                    logger.debug(f"Found a double: {k}")
+                    invalids.append(k)
+        all_invalids.extend(invalids)
+
+    logger.info(f"Found {len(all_invalids)} invalid IDs.")
+    logger.info(f"Sum of invalid IDs is {sum(all_invalids)}.")
+
+if __name__ == "__main__":
+    main()

day2-2.py

@@ -0,0 +1,57 @@
+# encoding: utf-8
+
+# Given a list of comma-separated pairs of numbers separated by a dash
+# e.g. 111-999,22-33
+# find all the numbers that are some sequence of digits repeated 
+# any number of times
+
+import logging
+import random
+import re
+
+logger = logging.Logger(__name__)
+logger.addHandler(logging.StreamHandler())
+logger.setLevel(logging.INFO)
+
+TESTING = False
+
+INPUT_FILE = "day2_test_input.txt" if TESTING else "day2_input.txt"
+
+def main():
+    with open(INPUT_FILE, "r") as f:
+        input_line = f.readline().strip()
+    inranges = [x.strip() for x in input_line.split(",")]
+    num_ranges = len(inranges)
+    tenths = num_ranges//10
+    logger.debug(f"Received {num_ranges} ranges.")
+    all_invalids = []
+    for i, r in enumerate(inranges):
+        if tenths and i % tenths == 0:
+            logger.debug(f"Processing range {i}.")
+        x, y = [int(q) for q in r.strip().split("-")]
+        logger.debug(f"x: {x}, y: {y}")
+        invalids = []
+        k = x
+        while k <= y:
+            found = False
+            s_k = str(k)
+            l = len(s_k)
+            m = l//2
+            t = 1
+            while not found and t <= m:
+                pattern = fr'^({s_k[:t]}){{2,}}$'
+                found = re.match(pattern, s_k) is not None
+                # if random.randint(1,10) == 1:
+                logger.debug(f"Pattern: {pattern}, value: {s_k}, found: {found}")
+                if found:
+                    logger.debug(f"Found a multiple: {k}")
+                    invalids.append(k)
+                t += 1
+            k += 1
+        all_invalids.extend(invalids)
+
+    logger.info(f"Found {len(all_invalids)} invalid IDs.")
+    logger.info(f"Sum of invalid IDs is {sum(all_invalids)}.")
+
+if __name__ == "__main__":
+    main()

day2_input.txt

@@ -0,0 +1 @@
+2157315-2351307,9277418835-9277548385,4316210399-4316270469,5108-10166,872858020-872881548,537939-575851,712-1001,326613-416466,53866-90153,907856-1011878,145-267,806649-874324,6161532344-6161720341,1-19,543444404-543597493,35316486-35418695,20-38,84775309-84908167,197736-309460,112892-187377,336-552,4789179-4964962,726183-793532,595834-656619,1838-3473,3529-5102,48-84,92914229-92940627,65847714-65945664,64090783-64286175,419838-474093,85-113,34939-52753,14849-30381

day2_test_input.txt

@@ -0,0 +1 @@
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124