title: Number Triangles N Moves
signature: class Solution {
  
      public long NumberTrianglesNMoves(int n) {
test_code: using System;
  using System.Numerics;
  using System.Diagnostics;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Security.Cryptography;
  using System.Web.UI;
  using System.Web.Script.Serialization;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  namespace EvaluatePrediction {
      class TestRunner {
          public bool ValidateSolution(long actual, long expected){
              return new JavaScriptSerializer().Serialize(actual) == new JavaScriptSerializer().Serialize(expected);
          }
  
          public string driver(int n, long expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                long pred_result = solution_cls.PLACEHOLDER_FN_NAME(n); 
                if (ValidateSolution(
                      pred_result,
                      expected)){
                  return "PASSED";
                }
                return "FAILED";
              } 
              catch (Exception exception_obj)
              {
                return exception_obj.GetType().FullName;
              }
          }
          static void Main(string[] args) {
              TestRunner runner = new TestRunner();
              String result;
              result = runner.driver(
                  33, 
                  11118121133111045
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  8, 
                  13121
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  6, 
                  1457
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def number_triangles_n_moves(n):
      answer = ([None] * (n + 1))
      answer[0] = 1
      i = 1
      while (i <= n):
          answer[i] = ((answer[(i - 1)] * 3) + 2)
          i = (i + 1)
      return answer[n]
source_cpp: int number_triangles_n_moves(int n) {
    int answer [ n + 1 ] = {
      0 };
      answer [ 0 ] = 1;
      for ( int i = 1;
      i <= n;
      i ++ ) answer [ i ] = answer [ i - 1 ] * 3 + 2;
      return answer [ n ];
    }