title: Smallest Power Of 2 Greater Than Or Equal To N 1
signature: function smallest_power_of_2_greater_than_or_equal_to_n_1(n)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(n, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(n) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver(31, 32)
      print(string.format("TEST-0...%s",result))
  
      result = driver(89, 128)
      print(string.format("TEST-1...%s",result))
  
      result = driver(92, 128)
      print(string.format("TEST-2...%s",result))
  
      result = driver(66, 128)
      print(string.format("TEST-3...%s",result))
  
      result = driver(38, 64)
      print(string.format("TEST-4...%s",result))
  
      result = driver(34, 64)
      print(string.format("TEST-5...%s",result))
  
      result = driver(17, 32)
      print(string.format("TEST-6...%s",result))
  
      result = driver(24, 32)
      print(string.format("TEST-7...%s",result))
  
      result = driver(54, 64)
      print(string.format("TEST-8...%s",result))
  
      result = driver(20, 32)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def smallest_power_of_2_greater_than_or_equal_to_n_1(n):
      p = 1
      if (n and (not (n & (n - 1)))):
          return n
      while (p < n):
          p <<= 1
      return p
source_cpp: unsigned int smallest_power_of_2_greater_than_or_equal_to_n_1(unsigned int n) {
    unsigned int p = 1;
    if ( n && ! ( n & ( n - 1 ) ) ) return n;
    while ( p < n ) p <<= 1;
    return p;
  }