add day 15

15/1.py

@@ -0,0 +1,25 @@
+content = [2,0,6,12,1,3]
+
+spoken = {}
+new_number = 0
+last_spoken = 0
+turn = 1
+for c in content:
+    spoken[c] = turn
+    last_spoken = c
+    turn += 1
+
+was_new = True
+for turn in range(len(content) + 1, 2021):
+    if was_new:
+        new_spoken = 0
+    else:
+        new_spoken = turn - 1 - last_turn
+
+    was_new = new_spoken not in spoken
+    if not was_new:
+        last_turn = spoken[new_spoken]
+    spoken[new_spoken] = turn
+    last_spoken = new_spoken
+
+print(last_spoken)

15/2.py

@@ -0,0 +1,25 @@
+content = [2,0,6,12,1,3]
+
+spoken = {}
+new_number = 0
+last_spoken = 0
+turn = 1
+for c in content:
+    spoken[c] = turn
+    last_spoken = c
+    turn += 1
+
+was_new = True
+for turn in range(len(content) + 1, 30000001):
+    if was_new:
+        new_spoken = 0
+    else:
+        new_spoken = turn - 1 - last_turn
+
+    was_new = new_spoken not in spoken
+    if not was_new:
+        last_turn = spoken[new_spoken]
+    spoken[new_spoken] = turn
+    last_spoken = new_spoken
+
+print(last_spoken)