title: Sum Series 555555 N Terms
signature: pub fn sum_series_555555_n_terms(n: i32) -> i64 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: i64, expected: i64)->bool{
  return actual==expected
  }
  pub fn driver(n: i32, expected: i64)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(n), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        18, 
        617200000000000000
      ));
      
      println!("TEST-1...{}", driver(
        14, 
        61719999999991
      ));
      
      println!("TEST-2...{}", driver(
        15, 
        617199999999991
      ));
      
      println!("TEST-3...{}", driver(
        3, 
        614
      ));
      
  }
source_py: def sum_series_555555_n_terms(n):
      return int(((0.6172 * (pow(10, n) - 1)) - (0.55 * n)))
source_cpp: int sum_series_555555_n_terms(int n) {
    return 0.6172 * ( pow ( 10, n ) - 1 ) - 0.55 * n;
  }