using System;

using System.Linq;

/*

  SharpLab tools in Run mode:

    • value.Inspect()

    • Inspect.Heap(object)

    • Inspect.Stack(value)

    • Inspect.MemoryGraph(value1, value2, …)

*/

public static class Program {

    public static void Main() {

        var a = new int[10];

        var result = new int[a.Length];

        for (var i = 0; i < a.Length; i++) {

            result[i] = Log($"A {i}", i);

            result[i] = Log($"B {i}", result[i]*result[i]);

        }

        Console.WriteLine("     ");

        var res2 = a

            .Select((_, i) => Log($"A {i}", i))

            .Select((x, i) => Log($"B {i}", x*x))

            .ToArray();

    }

    private static int Log(string message, int val) {

        Console.WriteLine(message);

        return val;

    }

}