using System;

using System.Net.Http;

using System.Collections.Generic;

using System.Linq;

​

// Get data

var response = await new HttpClient().GetStringAsync("https://tompafireadventofcode.free.beeceptor.com/day1"); 

var values = response.Split(Environment.NewLine).Select(int.Parse);

​

// Step 1

IEnumerable<(int val, int nextVal)> valuesWithNextValue = values.Zip(values.Skip(1));

var numberOfIncreases = valuesWithNextValue.Count(x => x.nextVal > x.val);

Console.WriteLine(numberOfIncreases);

​

// Step 2

var windows = values.Select((_, index) => values.Skip(index).Take(3));

IEnumerable<(IEnumerable<int> window, IEnumerable<int> nextWindow)> windowsWithNextWindow = windows.Zip(windows.Skip(1));

var numberOfWindowIncreases = windowsWithNextWindow.Count(x => x.nextWindow.Sum() > x.window.Sum());

Console.WriteLine(numberOfWindowIncreases);

​