Day 3

day3/day3.py

@@ -0,0 +1,46 @@
+def sameInString(firstHalf, secondHalf):
+    splitFirst = list(firstHalf)
+    for i in splitFirst:
+        if i in secondHalf:
+            return i
+    return None
+
+
+def sameInThreeStrings(first, second, third):
+    splitFirst = list(first)
+    for i in splitFirst:
+        if i in second and i in third:
+            return i
+    return None
+
+
+with open("./day3.txt", "r") as f:
+    file = f.read()
+
+x = file.split("\n")
+prioritySum = 0
+for backpack in x:
+    firstHalf = backpack[:int((len(backpack)/2))]
+    secondHalf = backpack[int((len(backpack)/2)):]
+    same = sameInString(firstHalf, secondHalf)
+    if same is None:
+        continue
+    if same.islower():
+        prioritySum += ord(same)-96
+    else:
+        prioritySum += ord(same)-38
+
+print("Priority sum for first is", prioritySum)
+
+prioritySum = 0
+for i in range(0, len(x)-1, 3):
+    backpack1 = x[i]
+    backpack2 = x[i+1]
+    backpack3 = x[i+2]
+    same = sameInThreeStrings(backpack1, backpack2, backpack3)
+    if same is None:
+        continue
+    if same.islower():
+        prioritySum += ord(same)-96
+    else:
+        prioritySum += ord(same)-38