suggested detail

Author: fchapoton

src/sage/combinat/partition.py

@@ -4201,8 +4201,9 @@ def zero_one_sequence(self):
             sage: all(Partitions().from_zero_one(mu.zero_one_sequence()) == mu for n in range(10) for mu in Partitions(n))
             True
         """
-        tmp = [self[i] - i for i in range(len(self))]
-        return [Integer(i not in tmp) for i in range(-len(self) + 1, self.get_part(0) + 1)]
+        tmp = set(self[i] - i for i in range(len(self)))
+        return [Integer(i not in tmp)
+                for i in range(-len(self) + 1, self.get_part(0) + 1)]
 
     def core(self, length):
         r"""