leet-code/src/main/java/leetcode/editor/cn/DisplayTableOfFoodOrdersInARestaurant.java

//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,foodIt
//emi] ，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"],["Melis
//sa","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。 
// 
// Related Topics 数组 哈希表 字符串 有序集合 排序 
// 👍 30 👎 0

package leetcode.editor.cn;

import java.util.*;
import java.util.stream.Collectors;

//1418:点菜展示表
public class DisplayTableOfFoodOrdersInARestaurant {
    public static void main(String[] args) {
        //测试代码
        Solution solution = new DisplayTableOfFoodOrdersInARestaurant().new Solution();
        System.out.println(solution.displayTable(
                Arrays.asList(
                        Arrays.asList("David", "3", "Ceviche"),
                        Arrays.asList("Corina", "10", "Beef Burrito"),
                        Arrays.asList("David", "3", "Fried Chicken"),
                        Arrays.asList("Carla", "5", "Water"),
                        Arrays.asList("Carla", "5", "Ceviche"),
                        Arrays.asList("Rous", "3", "Ceviche")
                )
//                new ListListString("[[\"David\",\"3\",\"Ceviche\"],[\"Corina\",\"10\",\"Beef Burrito\"],[\"David\",\"3\",\"Fried Chicken\"],[\"Carla\",\"5\",\"Water\"],[\"Carla\",\"5\",\"Ceviche\"],[\"Rous\",\"3\",\"Ceviche\"]]").get()
        ));
    }

    //力扣代码
    //leetcode submit region begin(Prohibit modification and deletion)
    class Solution {
        public List<List<String>> displayTable(List<List<String>> orders) {
            Map<Integer, Map<String, Integer>> map = new HashMap<>();
            Set<String> foods = new HashSet<>();
            for (List<String> order : orders) {
                int key = Integer.parseInt(order.get(1));
                Map<String, Integer> orderMap = map.getOrDefault(key, new HashMap<>());
                orderMap.put(order.get(2), orderMap.getOrDefault(order.get(2), 0) + 1);
                map.put(key, orderMap);
                foods.add(order.get(2));
            }
            List<String> items = foods.stream().sorted().collect(Collectors.toList());
            items.add(0, "Table");
            orders = new ArrayList<>();
            orders.add(items);

            Object[] keys = map.keySet().toArray();
            Arrays.sort(keys);
            for (Object key : keys) {
                List<String> list = new ArrayList<>();
                for (int i = 1; i < items.size(); i++) {
                    list.add(map.get(key).getOrDefault(items.get(i), 0).toString());
                }
                list.add(0, key.toString());
                orders.add(list);
            }
            return orders;
        }
    }
//leetcode submit region end(Prohibit modification and deletion)

}