Continue with 2016 and 2017.

2016/d14.py

@@ -0,0 +1,57 @@
+import hashlib
+from dataclasses import dataclass
+
+
+@dataclass
+class Candidate:
+    char: str
+    age: int
+    orig_hash: int
+    conf_hash: int = 0
+
+data = "cuanljph"
+# data = "abc"
+
+keys = []
+candidates = []
+rehashs = 2016 # part 2
+rehashs = 0 # part 1
+
+for hash_idx in range(0, 100_000):
+    h = hashlib.md5(f"{data}{hash_idx}".encode()).hexdigest()
+    for _ in range(rehashs):
+        h = hashlib.md5(h.encode()).hexdigest()
+
+    idx3 = None
+    for i in range(len(h) - 3):
+        if all([h[i] == h[i + j] for j in range(3)]):
+            idx3 = i
+            break
+
+    if idx3 is not None:
+        candidates.append(Candidate(h[idx3], 0, hash_idx))
+
+    letters = []
+    for i in range(len(h) - 5):
+        if all([h[i] == h[i + j] for j in range(5)]):
+            letters.append(h[i])
+
+    for current_char in set(letters):
+        for c in candidates:
+            if c.char == current_char and c.age > 0:
+                # print(f"Confirmed {c} at {hash_idx}.")
+                keys.append(c)
+                c.age = 1000 # mark for removal from candidates
+                c.conf_hash = hash_idx
+
+    if len(keys) >= 64:
+        # print("done")
+        break
+
+    # remove old candidates
+    candidates = [c for c in candidates if c.age < 1000]
+    for c in candidates:
+        c.age += 1
+
+keys.sort(key=lambda c: c.orig_hash)
+print(keys[63].orig_hash)