first 3 days

2/1.py

@@ -0,0 +1,24 @@
+def safe(levels: list[int]) -> bool:
+    i = 0
+    # figure out the diffs
+    diffs = []
+    while i < len(levels) - 1:
+        curr, nxt = levels[i], levels[i+1]
+        diffs.append(curr - nxt)
+        i += 1
+    if 0 in diffs:
+        return False
+    neg = len(list(filter(lambda d: d < 0, diffs)))
+    pos = len(list(filter(lambda d: d > 0, diffs)))
+    big = len(list(filter(lambda d: abs(d) > 3, diffs)))
+    if big > 0:
+        return False
+    return (neg == 0 and pos == len(diffs)) or (neg == len(diffs) and pos == 0)
+
+
+
+with open('1.input') as file:
+    reports = [[int(i) for i in line.split()] for line in file]
+
+
+print(sum([1 if r else 0 for r in [safe(report) for report in reports]]))

2/2.py

@@ -0,0 +1,30 @@
+def error_count(levels: list[int]) -> bool:
+    i = 0
+    # figure out the diffs
+    diffs = []
+    while i < len(levels) - 1:
+        curr, nxt = levels[i], levels[i+1]
+        diffs.append(curr - nxt)
+        i += 1
+    neg = len(list(filter(lambda d: d < 0, diffs)))
+    pos = len(list(filter(lambda d: d > 0, diffs)))
+    big = len(list(filter(lambda d: abs(d) > 3, diffs)))
+    zer = len(list(filter(lambda d: d == 0, diffs)))
+    errors = big + zer
+    errors += int((neg == 0 and pos == len(diffs))) + int((neg == len(diffs) and pos == 0))
+    return errors
+
+
+
+with open('data.input') as file:
+    reports = [[int(i) for i in line.split()] for line in file]
+
+
+
+# 0 or 1 is now tolerable
+safe = 0
+for report in reports:
+    # print(error_count(report))
+    safe += int(error_count(report) <= 1)
+else:
+    print('safe', safe)

2/sample.input

@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9