Problem 3 – Trapezoid

//Write a program that prints on the console the border of a trapezoid by given number N.
//The width of the top side of the trapezoid must be exactly N.
//The width of the bottom side of the trapezoid must be exactly 2 * N.
//The height of the trapezoid must be exactly N + 1.
//Also the top right and the bottom right angle of the trapezoid must be equal to 90 degrees.
//See the examples bellow.
//Input
//The input data is being read from the console.
//On the only line in the console you are given an integer number N, showing the width of the smallest trapezoid side.
//The input data will always be valid and in the format described. There is no need to check it explicitly.
//Output
//The output data must be printed on the console.
//You must write the border of the described trapezoid on the console.
//Use the symbol “*” (asterisk) to mark the border of the trapezoid.
//Use the symbol “.” (dot) to illustrate the empty spaces outside and inside the trapezoid.
//Constraints
//•   The number N is a positive integer between 3 and 39, inclusive.
//•   Allowed working time for your program: 0.25 seconds.
//•   Allowed memory: 16 MB.


using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.WriteLine("{0}{1}", new string('.', n), new string('*', n));
        for (int i = 1; i < n; i++)
        {
            Console.Write("{0}", new string('.', n - i));
            Console.Write('*');
            Console.Write("{0}", new string('.', (n + i)-2));
            Console.Write('*');
            Console.WriteLine();
        }
        Console.WriteLine("{0}", new string('*', n*2));
    }
}