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中等
1485
第 185 场周赛 Q2
数组
哈希表
字符串
有序集合
排序

1418. 点菜展示表

English Version

题目描述

给你一个数组 orders，表示客户在餐厅中完成的订单，确切地说， orders[i]=[customerNamei,tableNumberi,foodItemi] ，其中 customerNamei 是客户的姓名，tableNumberi 是客户所在餐桌的桌号，而 foodItemi 是客户点的餐品名称。

请你返回该餐厅的 点菜展示表 。在这张表中，表中第一行为标题，其第一列为餐桌桌号 “Table” ，后面每一列都是按字母顺序排列的餐品名称。接下来每一行中的项则表示每张餐桌订购的相应餐品数量，第一列应当填对应的桌号，后面依次填写下单的餐品数量。

注意：客户姓名不是点菜展示表的一部分。此外，表中的数据行应该按餐桌桌号升序排列。

 

示例 1：

输入：orders = [["David","3","Ceviche"],["Corina","10","Beef Burrito"],["David","3","Fried Chicken"],["Carla","5","Water"],["Carla","5","Ceviche"],["Rous","3","Ceviche"]]
输出：[["Table","Beef Burrito","Ceviche","Fried Chicken","Water"],["3","0","2","1","0"],["5","0","1","0","1"],["10","1","0","0","0"]] 
解释：
点菜展示表如下所示：
Table,Beef Burrito,Ceviche,Fried Chicken,Water
3    ,0           ,2      ,1            ,0
5    ,0           ,1      ,0            ,1
10   ,1           ,0      ,0            ,0
对于餐桌 3：David 点了 "Ceviche" 和 "Fried Chicken"，而 Rous 点了 "Ceviche"
而餐桌 5：Carla 点了 "Water" 和 "Ceviche"
餐桌 10：Corina 点了 "Beef Burrito"

示例 2：

输入：orders = [["James","12","Fried Chicken"],["Ratesh","12","Fried Chicken"],["Amadeus","12","Fried Chicken"],["Adam","1","Canadian Waffles"],["Brianna","1","Canadian Waffles"]]
输出：[["Table","Canadian Waffles","Fried Chicken"],["1","2","0"],["12","0","3"]] 
解释：
对于餐桌 1：Adam 和 Brianna 都点了 "Canadian Waffles"
而餐桌 12：James, Ratesh 和 Amadeus 都点了 "Fried Chicken"

示例 3：

输入：orders = [["Laura","2","Bean Burrito"],["Jhon","2","Beef Burrito"],["Melissa","2","Soda"]]
输出：[["Table","Bean Burrito","Beef Burrito","Soda"],["2","1","1","1"]]

 

提示：

  • 1 <= orders.length <= 5 * 10^4
  • orders[i].length == 3
  • 1 <= customerNamei.length, foodItemi.length <= 20
  • customerNamei 和 foodItemi 由大小写英文字母及空格字符 ' ' 组成。
  • tableNumberi 是 1 到 500 范围内的整数。

解法

方法一

Python3

class Solution:
    def displayTable(self, orders: List[List[str]]) -> List[List[str]]:
        tables = set()
        foods = set()
        mp = Counter()
        for _, table, food in orders:
            tables.add(int(table))
            foods.add(food)
            mp[f'{table}.{food}'] += 1
        foods = sorted(list(foods))
        tables = sorted(list(tables))
        res = [['Table'] + foods]
        for table in tables:
            t = [str(table)]
            for food in foods:
                t.append(str(mp[f'{table}.{food}']))
            res.append(t)
        return res

Java

class Solution {
    public List<List<String>> displayTable(List<List<String>> orders) {
        Set<Integer> tables = new HashSet<>();
        Set<String> foods = new HashSet<>();
        Map<String, Integer> mp = new HashMap<>();
        for (List<String> order : orders) {
            int table = Integer.parseInt(order.get(1));
            String food = order.get(2);
            tables.add(table);
            foods.add(food);
            String key = table + "." + food;
            mp.put(key, mp.getOrDefault(key, 0) + 1);
        }
        List<Integer> t = new ArrayList<>(tables);
        List<String> f = new ArrayList<>(foods);
        Collections.sort(t);
        Collections.sort(f);
        List<List<String>> res = new ArrayList<>();
        List<String> title = new ArrayList<>();
        title.add("Table");
        title.addAll(f);
        res.add(title);
        for (int table : t) {
            List<String> tmp = new ArrayList<>();
            tmp.add(String.valueOf(table));
            for (String food : f) {
                tmp.add(String.valueOf(mp.getOrDefault(table + "." + food, 0)));
            }
            res.add(tmp);
        }
        return res;
    }
}

C++

class Solution {
public:
    vector<vector<string>> displayTable(vector<vector<string>>& orders) {
        unordered_set<int> tables;
        unordered_set<string> foods;
        unordered_map<string, int> mp;
        for (auto& order : orders) {
            int table = stoi(order[1]);
            string food = order[2];
            tables.insert(table);
            foods.insert(food);
            ++mp[order[1] + "." + food];
        }
        vector<int> t;
        t.assign(tables.begin(), tables.end());
        sort(t.begin(), t.end());
        vector<string> f;
        f.assign(foods.begin(), foods.end());
        sort(f.begin(), f.end());
        vector<vector<string>> res;
        vector<string> title;
        title.push_back("Table");
        for (auto e : f) title.push_back(e);
        res.push_back(title);
        for (int table : t) {
            vector<string> tmp;
            tmp.push_back(to_string(table));
            for (string food : f) {
                tmp.push_back(to_string(mp[to_string(table) + "." + food]));
            }
            res.push_back(tmp);
        }
        return res;
    }
};

Go

func displayTable(orders [][]string) [][]string {
	tables := make(map[int]bool)
	foods := make(map[string]bool)
	mp := make(map[string]int)
	for _, order := range orders {
		table, food := order[1], order[2]
		t, _ := strconv.Atoi(table)
		tables[t] = true
		foods[food] = true
		key := table + "." + food
		mp[key] += 1
	}
	var t []int
	var f []string
	for i := range tables {
		t = append(t, i)
	}
	for i := range foods {
		f = append(f, i)
	}
	sort.Ints(t)
	sort.Strings(f)
	var res [][]string
	var title []string
	title = append(title, "Table")
	for _, e := range f {
		title = append(title, e)
	}
	res = append(res, title)
	for _, table := range t {
		var tmp []string
		tmp = append(tmp, strconv.Itoa(table))
		for _, food := range f {
			tmp = append(tmp, strconv.Itoa(mp[strconv.Itoa(table)+"."+food]))
		}
		res = append(res, tmp)
	}
	return res
}