How to plot histogram from 2 arrays?

[python_newbie09]

I have two arrays where the first array shows the unique values extracted from a column and the second array stores the frequency of these unique values. How can I correctly plot the histogram?

(array([0, 1, 2, 3, 4], dtype=uint8), array([ 1, 20, 20, 30, 45], dtype=int64))

0,1,2,3,4 are the unique values and the numbers in the second array shows the frequency of each of the value.

I tried to do the code as below but it is not producing the correct histogram

b = ([0,1,2,3,4],[1,20,20,39,45])
x = b[0]
print (x)
y = b[1]
print(y)
plt.hist([x,y], bins='auto') 
plt.show()]

Thank you