title: Sum Binomial Coefficients 1
signature: pub fn sum_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(
        48, 
        281474976710656
      ));
      
      println!("TEST-1...{}", driver(
        42, 
        4398046511104
      ));
      
      println!("TEST-2...{}", driver(
        15, 
        32768
      ));
      
      println!("TEST-3...{}", driver(
        23, 
        8388608
      ));
      
      println!("TEST-4...{}", driver(
        41, 
        2199023255552
      ));
      
      println!("TEST-5...{}", driver(
        46, 
        70368744177664
      ));
      
      println!("TEST-6...{}", driver(
        36, 
        68719476736
      ));
      
      println!("TEST-7...{}", driver(
        53, 
        9007199254740992
      ));
      
  }
source_py: def sum_binomial_coefficients_1(n):
      return (1 << n)
source_cpp: int sum_binomial_coefficients_1(int n) {
    return ( 1 << n );
  }