hash = defaultdict(int) # 用于存放当前获得的水果的种类
for i in range(len(tree)):
hash...(, {3: 1})
1
defaultdict(, {3: 2})
2
defaultdict(, {3: 3})
3
defaultdict...(, {3: 3, 1: 1})
4
defaultdict(, {3: 3, 1: 1, 2: 1})
4
defaultdict(, {1: 2, 2: 1})
4
defaultdict(, {1: 3, 2: 1})
4
defaultdict(, {1: 3, 2...: 2})
5
defaultdict(, {1: 3, 2: 2, 3: 1})
5
defaultdict(, {2: 1, 3: 2})
5
defaultdict