first 13 stars

4/twostar.py

@@ -0,0 +1,26 @@
+elves = []
+count = 0
+
+def inrange(lb, ub, check):
+    """Returns true iff check is inclusive in-between lb and ub."""
+    return check >= lb and check <= ub
+
+with open("input.txt", "r") as f:
+    for line in f.readlines():
+        line = line.strip("\n")
+        # Some python magic to split out the strings and convert them to integers
+        pair = [x.split("-") for x in line.split(",")]
+        pair = [[int(y) for y in x] for x in pair]
+        elves.append(pair)
+        # Elves is now a list of list of lists.
+    for elf in elves:
+        lb1 = elf[0][0]
+        lb2 = elf[1][0]
+        ub1 = elf[0][1]
+        ub2 = elf[1][1]
+        if (inrange(lb1, ub1, ub2) or
+            inrange(lb1, ub1, lb2) or
+            inrange(lb2, ub2, ub1) or
+            inrange(lb2, ub2, lb1)):
+            count += 1
+print(count)