title: Find Sum Even Index Binomial Coefficients 1
signature: pub fn find_sum_even_index_binomial_coefficients_1(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(
        56, 
        36028797018963968
      ));
      
      println!("TEST-1...{}", driver(
        28, 
        134217728
      ));
      
      println!("TEST-2...{}", driver(
        4, 
        8
      ));
      
      println!("TEST-3...{}", driver(
        24, 
        8388608
      ));
      
      println!("TEST-4...{}", driver(
        30, 
        536870912
      ));
      
      println!("TEST-5...{}", driver(
        48, 
        140737488355328
      ));
      
      println!("TEST-6...{}", driver(
        32, 
        2147483648
      ));
      
      println!("TEST-7...{}", driver(
        13, 
        4096
      ));
      
      println!("TEST-8...{}", driver(
        19, 
        262144
      ));
      
  }
source_py: def find_sum_even_index_binomial_coefficients_1(n):
      return (1 << (n - 1))
source_cpp: int find_sum_even_index_binomial_coefficients_1(int n) {
    return ( 1 << ( n - 1 ) );
  }