day2

day2/main.py

@@ -0,0 +1,39 @@
+safe_reports = 0
+with open("input.txt", "r") as file_input:
+    for row in file_input:
+        report = list(map(int, row.split(" ")))
+
+        increasing = None
+        report_size = len(report)
+        safe_count = 0
+
+        for i in range(report_size):
+            if i == 0:
+                continue
+
+            current_number = report[i]
+            last_number = report[i-1]
+
+            difference = last_number - current_number
+
+            # Figure out if we're increasing or decreasing values in this row
+            if increasing is None:
+                if difference < 0 and (abs(difference) < 4):
+                    increasing = True
+                elif difference > 0 and (abs(difference) < 4):
+                    increasing = False
+                else:
+                    break
+            # Once we figure it out just make sure we stay in our 3 pt range and don't
+            # decrease if we're supposed to be increasing or vice versa
+            elif increasing and (-4 < difference < 0):
+                safe_count += 1
+            elif not (increasing) and (0 < difference < 4):
+                safe_count += 1
+            else:
+                break
+
+            if safe_count == (report_size - 2):
+                safe_reports += 1
+
+print(safe_reports)

day2/test_input.txt

@@ -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