add day 2

day2/day2.py

@@ -0,0 +1,34 @@
+import sys
+sys.path.append('../aoclib')
+
+from aoclib import Input
+
+def is_safe_pair(a: int, b: int, min_diff=1, max_diff=3, inc=True):
+    if b > a and not inc:
+        return False
+    if b < a and inc:
+        return False
+
+    diff = abs(a-b)
+    return diff >= min_diff and diff <= max_diff
+
+def is_safe_report(l: list, violations=0) -> bool:
+    increasing = l[1] > l[0]
+    found_violations = 0
+
+    for i in range(len(l)-1):
+        if not is_safe_pair(l[i], l[i+1], inc=increasing):
+            found_violations += 1
+      
+    return found_violations <= violations
+    
+    
+if __name__ == '__main__':
+    #reports = Input('input_test.txt').lines_as_int_lists()
+    reports = Input('input.txt').lines_as_int_lists()
+
+    #part 1
+    print('part 1:', sum([is_safe_report(r) for r in reports]))
+
+    #part 2
+    print('part 1:', sum([is_safe_report(r, violations=1) for r in reports]))