title: Smallest Power Of 2 Greater Than Or Equal To N 2
signature: pub fn smallest_power_of_2_greater_than_or_equal_to_n_2(n: i32) -> i32 {
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: i32, expected: i32)->bool{
  return actual==expected
  }
  pub fn driver(n: i32, expected: i32)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(n), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        60, 
        64
      ));
      
      println!("TEST-1...{}", driver(
        20, 
        32
      ));
      
      println!("TEST-2...{}", driver(
        33, 
        64
      ));
      
      println!("TEST-3...{}", driver(
        34, 
        64
      ));
      
      println!("TEST-4...{}", driver(
        68, 
        128
      ));
      
      println!("TEST-5...{}", driver(
        79, 
        128
      ));
      
      println!("TEST-6...{}", driver(
        20, 
        32
      ));
      
      println!("TEST-7...{}", driver(
        41, 
        64
      ));
      
      println!("TEST-8...{}", driver(
        36, 
        64
      ));
      
      println!("TEST-9...{}", driver(
        17, 
        32
      ));
      
  }
source_py: def smallest_power_of_2_greater_than_or_equal_to_n_2(n):
      n -= 1
      n |= (n >> 1)
      n |= (n >> 2)
      n |= (n >> 4)
      n |= (n >> 8)
      n |= (n >> 16)
      n += 1
      return n
source_cpp: unsigned int smallest_power_of_2_greater_than_or_equal_to_n_2(unsigned int n) {
    n --;
    n |= n >> 1;
    n |= n >> 2;
    n |= n >> 4;
    n |= n >> 8;
    n |= n >> 16;
    n ++;
    return n;
  }