2017 progress.

2016/d19.py

@@ -0,0 +1,18 @@
+data = open(0).read().strip()
+elf_count = int(data)
+
+elfs = [i for i in range(1, elf_count + 1)]
+while len(elfs) > 1:
+    is_odd = len(elfs) % 2 == 1
+    elfs = [elfs[i] for i in range(0, len(elfs), 2)]
+    if is_odd and len(elfs) > 1:
+        elfs = elfs[1:]
+print(elfs[0])
+
+# elfs = [i for i in range(1, elf_count + 1)]
+# current_i = 0
+# while len(elfs) > 1:
+#     remove_i = (current_i + len(elfs) // 2) % len(elfs)
+#     current_i = (current_i + 1) % len(elfs)
+#     elfs.pop(remove_i)
+# print(elfs[0])