using System;
using System.Collections.Generic;
using System.Text.Json;

class Program
{
    static void Main()
    {
        int t = int.Parse(Console.ReadLine()); // Количество наборов входных данных

        List<string> results = new List<string>(); // Список результатов

        for (int i = 0; i < t; i++)
        {
            int n = int.Parse(Console.ReadLine()); // Количество строк в JSON-объекте

            List<string> lines = new List<string>(); // Список строк JSON-объекта
            for (int j = 0; j < n; j++)
            {
                lines.Add(Console.ReadLine());
            }

            string json = string.Join("", lines); // Собираем JSON-объект из строк

            // Парсим JSON-объект
            JsonElement root = JsonSerializer.Deserialize<JsonElement>(json);

            // Применяем операцию prettify
            JsonElement prettified = Prettify(root);

            // Сериализуем результат обратно в JSON-строку
            string result = JsonSerializer.Serialize(prettified);
            results.Add(result);
        }

        // Выводим результаты
        foreach (var result in results)
        {
            Console.WriteLine(result);
        }
    }

    // Функция для применения операции prettify к JSON-объекту
    static JsonElement Prettify(JsonElement json)
    {
        if (json.ValueKind == JsonValueKind.Array)
        {
            // Создаем новый массив для преттифицированных элементов
            List<JsonElement> prettifiedArray = new List<JsonElement>();
            foreach (var item in json.EnumerateArray())
            {
                // Применяем операцию prettify к каждому элементу массива
                JsonElement prettifiedItem = Prettify(item);
                // Добавляем только непустые элементы
                if (!IsEmpty(prettifiedItem))
                {
                    prettifiedArray.Add(prettifiedItem);
                }
            }
            // Возвращаем преттифицированный массив
            return JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(prettifiedArray));
        }
        else if (json.ValueKind == JsonValueKind.Object)
        {
            // Создаем новый словарь для преттифицированных элементов
            Dictionary<string, JsonElement> prettifiedObject = new Dictionary<string, JsonElement>();
            foreach (var property in json.EnumerateObject())
            {
                // Применяем операцию prettify к каждому значению свойства объекта
                JsonElement prettifiedValue = Prettify(property.Value);
                // Добавляем только непустые значения
                if (!IsEmpty(prettifiedValue))
                {
                    prettifiedObject[property.Name] = prettifiedValue;
                }
            }
            // Возвращаем преттифицированный объект
            return JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(prettifiedObject));
        }
        // Возвращаем строковые значения как есть
        return json;
    }

    // Функция для проверки, является ли JSON-элемент пустым
    static bool IsEmpty(JsonElement json)
    {
        return json.ValueKind == JsonValueKind.Null || 
               (json.ValueKind == JsonValueKind.Array && json.GetArrayLength() == 0) || 
               (json.ValueKind == JsonValueKind.Object && json.EnumerateObject().Count() == 0);
    }
} 
by

C Sharp Online Compiler

Write, Run & Share C# code online using OneCompiler's C# online compiler for free. It's one of the robust, feature-rich online compilers for C# language, running on the latest version 8.0. Getting started with the OneCompiler's C# compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C# and start coding.

Read inputs from stdin

OneCompiler's C# online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

using System;
 
namespace Sample
{
  class Test
    {
      public static void Main(string[] args)
       {
         string name;
         name = Console.ReadLine();
         Console.WriteLine("Hello {0} ", name);
	}
     }
}

About C Sharp

C# is a general purpose object-oriented programming language by Microsoft. Though initially it was developed as part of .net but later it was approved by ECMA and ISO standards.

You can use C# to create variety of applications, like web, windows, mobile, console applications and much more using Visual studio.

Syntax help

Data types

Data TypeDescriptionRangesize
intTo store integers-2,147,483,648 to 2,147,483,6474 bytes
doubleto store large floating point numbers with decimalscan store 15 decimal digits8 bytes
floatto store floating point numbers with decimalscan store upto 7 decimal digits4 bytes
charto store single characters-2 bytes
stringto stores text-2 bytes per character
boolto stores either true or false-1 bit

Variables

Syntax

datatype variable-name = value;

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition or set of few conditions IF-ELSE is used.

if(conditional-expression) {
   // code
} 
else {
   // code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement) {
  // code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

data-type[] array-name;

Methods

Method is a set of statements which gets executed only when they are called. Call the method name in the main function to execute the method.

Syntax

static void method-name() 
{
  // code to be executed
}