## import modules here
import pandas as pd
import numpy as np
import helper
################### Question 1 ###################
def buc_rec_optimized(df):# do not change the heading of the function
pass # **replace** this line with your code
## import modules here
import pandas as pd
import numpy as np
import helper
################### Question 1 ###################
def buc_rec_optimized(df):# do not change the heading of the function
pass # **replace** this line with your code