Fix rerate logic (DMOJ)

judge/utils/ranker.py

@@ -13,22 +13,3 @@ def ranker(iterable, key=attrgetter('points'), rank=0):
         yield rank, item
         last = key(item)
 
-
-def tie_ranker(iterable, key=attrgetter('points')):
-    rank = 0
-    delta = 1
-    last = None
-    buf = []
-    for item in iterable:
-        new = key(item)
-        if new != last:
-            for i in buf:
-                yield rank + (delta - 1) / 2.0, i
-            rank += delta
-            delta = 0
-            buf = []
-        delta += 1
-        buf.append(item)
-        last = key(item)
-    for i in buf:
-        yield rank + (delta - 1) / 2.0, i