leetcode 1418

Posted 2021-08-01 东东就是我

class Solution:
    def displayTable(self, orders: List[List[str]]) -> List[List[str]]:
        foods = set()
        res = []
        table_info = collections.defaultdict(lambda: collections.defaultdict(int))
        for _, table, food in orders:
            table_info[table][food] += 1
            foods.add(food)
        foods = sorted(foods)
        res.append(['Table'] + foods)
        for info in sorted(table_info, key=lambda x: int(x)):
            temp = [info]
            for food in foods:
                temp.append(str(table_info.get(info).get(food, 0)))
            res.append(temp)
        return res

lambda x:int(x)= def f(x):
return int(x)
:前面的x表示要传入的参数，：后面表示要输出的结果

from collections import  defaultdict
table_info = defaultdict(lambda: defaultdict(int))
table_info['1']['fodd']=1
print(table_info)
{'1': defaultdict(<class 'int'>, {'fodd': 1})})

嵌套字典，