Day 2 2025 (solved part 2 before part 1 because I misread lol)

2 files changed, 37 insertions, 1 deletions

diff --git a/2025/02/a.py b/2025/02/a.py
index 5fdb11b..9c6fd84 100644
--- a/2025/02/a.py
+++ b/2025/02/a.py
@@ -1,6 +1,17 @@
 import fileinput
 
+def invalid(n):
+        return n[:len(n)//2] == n[len(n)//2:]
+
+s = 0
 with fileinput.input() as lines:
         for line in lines:
-                ...
+                for r in line.split(","):
+                        l = r.split("-");
+                        for n in range(int(l[0]), int(l[1])+1):
+                                if invalid(str(n)):
+                                        print(n)
+                                        s += n
+print(s)
+                                
 
diff --git a/2025/02/b.py b/2025/02/b.py
new file mode 100644
index 0000000..8efdbe3
--- /dev/null
+++ b/2025/02/b.py
@@ -0,0 +1,25 @@
+import fileinput
+
+def invk(n, k):
+        for i in range(0, len(n)-k, k):
+                if n[i:i+k] != n[i+k:i+2*k]:
+                        return False
+        return True
+
+def invalid(n):
+        for k in range(1, len(n)//2 + 1):
+                if invk(n, k):
+                        return True
+        return False
+
+s = 0
+with fileinput.input() as lines:
+        for line in lines:
+                for r in line.split(","):
+                        l = r.split("-");
+                        for n in range(int(l[0]), int(l[1])+1):
+                                if invalid(str(n)):
+                                        s += n
+print(s)
+                                
+