initial commit, day 10

02a.py

@@ -0,0 +1,19 @@
+with open('02a.txt') as f:
+    text = f.read().strip()
+
+def make_report(line):
+    return [int(x.strip()) for x in line.split()]
+
+reports = [make_report(x) for x in text.split('\n')]
+
+def test_report(report):
+    if len(report) == 1:
+        return True
+    dir = 1 if report[1] - report[0] > 0 else -1
+    for i in range(len(report)-1):
+        diff = (report[i+1] - report[i]) * dir
+        if diff < 1 or diff > 3:
+            return False
+    return True
+
+print(sum(test_report(x) for x in reports))