using System;

using System.Linq;

using System.Collections.Generic;

using System.Text;

​

/*

​

****************This is optimized Solution *****************

​

Link: [https://www.scaler.com/academy/mentee-dashboard/class/26141/assignment/problems/10695?navref=cl_tt_nv]

Problem Description

​

You are given a function isalpha() consisting of a character array A.

​

Return 1 if all the characters of a character array are alphanumeric (a-z, A-Z, and 0-9) else, return 0.

​

​

​

Problem Constraints

1 <= |A| <= 105

​

​

​

Input Format

Only argument is a character array A.

​

​

​

Output Format

Return 1 if all the characters of the character array are alphanumeric (a-z, A-Z and 0-9), else return 0.

​

​

​

Example Input

Input 1:

​

 A = ['S', 'c', 'a', 'l', 'e', 'r', 'A', 'c', 'a', 'd', 'e', 'm', 'y', '2', '0', '2', '0']

Input 2:

​

 A = ['S', 'c', 'a', 'l', 'e', 'r', '#', '2', '0', '2', '0']

​

​

Example Output

Output 1:

​

 1

Output 2:

​

 0

​

​

Example Explanation

Explanation 1:

​

 All the characters are alphanumeric.

Explanation 2:

​

 All the characters are NOT alphabets i.e ('#').

*/                  

public class Program

{

    private static int Solve_Is_AlphaNumeric(List<char> A)

    {

        int charLength = A.Count; int isAlphaNumeric = 1;

        List<char> toLowerList = new List<char>();

        for(var i = 0; i < charLength; i++){

            if((A[i] >= 'a' && A[i] <= 'z') || (A[i] >= 'A' && A[i] <= 'Z') || (A[i] >= '0' && A[i] <= '9')){

                isAlphaNumeric = 1;

            }else{ isAlphaNumeric = 0;break; }

        }

        return isAlphaNumeric;

    }

    public static void Main()

    {

        List<char> charList = new List<char>(){ 'S', 'c', 'A', 'l', 'e', 'r', 'A', 'c', 'a', 'D', 'e', 'm', 'y', '2', '0', '2', '0' };

        //List<char> charList = new List<char>(){ 'S', 'c', 'A', 'l', 'e', 'r', 'A', 'c', 'a', 'D', 'e', 'm', 'y' };

        //List<char> charList = new List<char>(){ 'S', 'c', 'a', 'L', 'e', 'r', '#', '2', '0', '2', '0' };

        int ConvertedLowerCaseCharacters = Program.Solve_Is_AlphaNumeric(charList);

        Console.WriteLine("After Sorting: " + ConvertedLowerCaseCharacters);

    }

}