From 8a21b6b78a9f249d45d9e3bf5fc8610e51958353 Mon Sep 17 00:00:00 2001
From: Bob <bob.git.noordstar@varke.nl>
Date: Tue, 2 Dec 2025 13:17:40 +0100
Subject: [PATCH] day02

---
 bob/day02/day02-p1.py      | 41 +++++++++++++++++++++++++
 bob/day02/day02-p2.py      | 61 ++++++++++++++++++++++++++++++++++++++
 bob/day02/example_input    |  1 +
 bob/day02/input            |  1 +
 bob/day02/my_example_input |  1 +
 5 files changed, 105 insertions(+)
 create mode 100644 bob/day02/day02-p1.py
 create mode 100644 bob/day02/day02-p2.py
 create mode 100644 bob/day02/example_input
 create mode 100644 bob/day02/input
 create mode 100644 bob/day02/my_example_input

diff --git a/bob/day02/day02-p1.py b/bob/day02/day02-p1.py
new file mode 100644
index 0000000..2cc827f
--- /dev/null
+++ b/bob/day02/day02-p1.py
@@ -0,0 +1,41 @@
+
+
+
+def check_id(start, end):
+    false_ids = []
+    for id in range(int(start), int(end)+1):
+        id_str = str(id)
+        id_str_len = len(id_str)
+        if id_str_len % 2 == 0:
+            h1 = id_str[:id_str_len//2]
+            h2 = id_str[id_str_len//2:]
+            if h1 == h2:
+                false_ids.append(id)
+
+    return false_ids
+
+
+
+def read_input(filename):
+    id_ranges = []
+    for line in open(filename).read().splitlines():
+        for id_range in line.split(","):
+            start = id_range.split("-")[0]
+            end = id_range.split("-")[1]
+
+            id_ranges.append((start,end))
+    return id_ranges
+
+
+# filename = "day02/example_input" # 1227775554
+filename = "day02/input" # 23560874270
+id_ranges = read_input(filename)
+
+
+adding = 0
+for id_range in id_ranges:
+    for false_id in check_id(id_range[0], id_range[1]):
+        adding += false_id
+
+
+print(f"Added total of false IDs: {adding}")
diff --git a/bob/day02/day02-p2.py b/bob/day02/day02-p2.py
new file mode 100644
index 0000000..ba8b327
--- /dev/null
+++ b/bob/day02/day02-p2.py
@@ -0,0 +1,61 @@
+
+
+
+def check_id(start_id, end_id):
+    false_ids = []
+    for id in range(int(start_id), int(end_id)+1):
+        id_str = str(id)
+        id_str_len = len(id_str)
+
+        for substr_len in range(1,(id_str_len//2)+1):
+            if id_str_len % substr_len > 0:
+                # Substring being checked must fit a whole number of times
+                continue
+
+            dup = False
+            # Substring position is determined by the amount of times the substring fits in the string
+            # That makes up the range to be checked (as multipliet with the substring length)
+            for substr_pos in range(1, id_str_len // substr_len):
+                h1 = id_str[:substr_len]
+
+                # Get the substring at right position, and only with size of substring
+                h2 = id_str[substr_len*substr_pos:][:substr_len]
+                if h1 != h2:
+                    dup = False
+                    break
+                else:
+                    dup = True
+
+            if dup:
+                false_ids.append(id)
+                break
+
+
+    return false_ids
+
+
+
+def read_input(filename):
+    id_ranges = []
+    for line in open(filename).read().splitlines():
+        for id_range in line.split(","):
+            start = id_range.split("-")[0]
+            end = id_range.split("-")[1]
+
+            id_ranges.append((start,end))
+    return id_ranges
+
+
+# filename = "day02/my_example_input" #
+# filename = "day02/example_input" # 4174379265
+filename = "day02/input" # 44143124633
+id_ranges = read_input(filename)
+
+
+adding = 0
+for id_range in id_ranges:
+    for false_id in check_id(id_range[0], id_range[1]):
+        adding += false_id
+
+
+print(f"Added total of false IDs: {adding}")
diff --git a/bob/day02/example_input b/bob/day02/example_input
new file mode 100644
index 0000000..a3f22ef
--- /dev/null
+++ b/bob/day02/example_input
@@ -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
diff --git a/bob/day02/input b/bob/day02/input
new file mode 100644
index 0000000..5066627
--- /dev/null
+++ b/bob/day02/input
@@ -0,0 +1 @@
+990244-1009337,5518069-5608946,34273134-34397466,3636295061-3636388848,8613701-8663602,573252-688417,472288-533253,960590-988421,7373678538-7373794411,178-266,63577667-63679502,70-132,487-1146,666631751-666711926,5896-10827,30288-52204,21847924-21889141,69684057-69706531,97142181-97271487,538561-555085,286637-467444,93452333-93519874,69247-119122,8955190262-8955353747,883317-948391,8282803943-8282844514,214125-236989,2518-4693,586540593-586645823,137643-211684,33-47,16210-28409,748488-837584,1381-2281,1-19
diff --git a/bob/day02/my_example_input b/bob/day02/my_example_input
new file mode 100644
index 0000000..a729ca2
--- /dev/null
+++ b/bob/day02/my_example_input
@@ -0,0 +1 @@
+12345678-12345679