day 4

4/a.py

@@ -0,0 +1,31 @@
+data = "172930-683082".split("-")
+
+min_, max_ = int(data[0]), int(data[1])
+
+
+def validate(num):
+    repeat = False
+    nums = str(num)
+    # print(nums)
+    for i, c in enumerate(nums):
+        if i == len(nums) - 1:
+            break
+        # print(i, len(nums))
+        nextc = nums[i + 1]
+        if nextc < c:
+            # print(f"not increasing, {nextc} < {c}")
+            return False  # not increasing
+        if c == nextc:
+            # print("found repeat")
+            repeat = True
+    return repeat
+
+
+matches = 0
+for i in range(min_, max_):
+    if validate(i):
+        matches += 1
+print(matches)
+
+
+# print(validate(123466))

4/b.py

@@ -0,0 +1,39 @@
+data = "172930-683082".split("-")
+
+min_, max_ = int(data[0]), int(data[1])
+
+
+def validate(num):
+    repeats = False
+    repeats_twice = False
+    repeatlen = 0
+    lastc = None
+    nums = str(num)
+
+    for i, c in enumerate(nums):
+        if lastc:
+            if c < lastc:
+                return False  # not rising
+        if c == lastc:
+            repeats = True
+            if repeatlen == 0:
+                repeatlen = 2
+            else:
+                repeatlen += 1
+        else:
+            if repeatlen == 2:
+                repeats_twice = True
+            repeatlen = 0
+
+        lastc = c
+
+    return repeats and (repeats_twice or repeatlen == 2)
+
+
+matches = 0
+for i in range(min_, max_):
+    if validate(i):
+        matches += 1
+print(matches)
+
+# print(validate(123466))