message: Update parallel-courses.py
diff: @@ -23,7 +23,7 @@ class Solution(object):
  while q:
  level, u = q.popleft()
  count -= 1
  - result = max(result, level)
  + result = level
  for v in g[u]:
  in_degree[v] -= 1
  if not in_degree[v]:
  