using System;

using System.Collections.Generic;

using System.Text.Json;

​

class Program

{

    // Define Person structure

    class Person

    {

        public string Name { get; set; }

        public string Color { get; set; }

        public int Min { get; set; }

        public int Max { get; set; }

    }

​

    // Define Item structure

    class Item

    {

        public string Color { get; set; }

        public int Size { get; set; }

    }

​

    // Define JSON structure

    class Data

    {

        public List<Person> People { get; set; }

        public List<Item> Items { get; set; }

    }

​

    static void Main()

    {

        // Properly formatted JSON string

        string json = @"{

            ""people"": [

                { ""name"": ""Mary"", ""color"": ""green"", ""min"": 1, ""max"": 5 },

                { ""name"": ""John"", ""color"": ""red"", ""min"": 2, ""max"": 6 }

            ],

            ""items"": [

                { ""color"": ""green"", ""size"": 5 },

                { ""color"": ""red"", ""size"": 3 },

                { ""color"": ""blue"", ""size"": 4 }

            ]

        }";

​

        try

        {

            // Enable case-insensitive property name matching

            var options = new JsonSerializerOptions

            {

                PropertyNameCaseInsensitive = true

            };

​

            // Deserialize JSON string into Data object

            Data data = JsonSerializer.Deserialize<Data>(json, options);

​

            if (data == null || data.People == null || data.Items == null)

            {

                Console.WriteLine("Error: JSON data is null or invalid.");

                return;

            }

​

            int totalItems = data.Items.Count;

            int unmatchedItems = 0;

            Dictionary<string, int> matchedCounts = new Dictionary<string, int>();

​

            foreach (var person in data.People)

            {

                matchedCounts[person.Name] = 0;

            }

​

            foreach (var item in data.Items)

            {

                bool matched = false;

​

                foreach (var person in data.People)

                {

                    if (item.Color == person.Color && item.Size >= person.Min && item.Size <= person.Max)

                    {

                        matchedCounts[person.Name]++;

                        matched = true;

                        break;  // Stop checking once matched

                    }

                }

​

                if (!matched)

                {

                    unmatchedItems++;

                }

            }

​

            // Print results

            Console.WriteLine($"Total items: {totalItems}");

            Console.WriteLine($"Total unmatched items: {unmatchedItems}");

            foreach (var match in matchedCounts)

            {

                Console.WriteLine($"Items matched by {match.Key}: {match.Value}");

            }

        }

        catch (Exception ex)

        {

            Console.WriteLine($"Error parsing JSON: {ex.Message}");

        }

    }

}