[백준] 16968번 : 차량 번호판 1 - C#

https://www.acmicpc.net/problem/16968

using System;

class Program
{
    static void Main() {
        string arr=Console.ReadLine();
        int count=1;
        for(int i=0;i<arr.Length;i++){
            if(i==0){
              if(arr[i]=='c') count*=26;
              else count*=10;
          }
          else{
              if(arr[i]==arr[i-1]){
                  if(arr[i]=='c') count*=25;
                  else count*=9;
              }
              else{
                  if(arr[i]=='c') count*=26;
                  else count*=10;
              }
          }
      }
      Console.Write(count);
    }
}