title: Number Triangles N Moves
signature: def numberTrianglesNMoves(n: Int) = {
test_code: import scala.collection.mutable.HashMap
  import scala.collection.immutable.HashSet
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  
  // TESTING CODE 
  // ============================================
  def validateSolution(actual: Long , expected: Long): Boolean = {
      actual.toString == expected.toString
  }
  
  def driver(n: Int, expected: Long): String = {
      try {
          if (validateSolution(PLACEHOLDER_FN_NAME(n),expected)) {
              "PASSED"
          } else{
              "FAILED"
          }
      }catch{
          case e: Exception => {e.getClass.getName}
      }
  
  }
  object QuestionEvaluator extends App {
  
      println(s"TEST-0...${driver(
        33, 
        11118121133111045L    
      )}")   
  
  
      println(s"TEST-1...${driver(
        8, 
        13121L    
      )}")   
  
  
      println(s"TEST-2...${driver(
        6, 
        1457L    
      )}")   
  
  }
  
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 ];
    }