Its idea is to compare the numbers in the array according to the number of digits, take the bits with basically the same size or little change as the trunk (stem), and list the numbers with big change as branches (leaves) behind the trunk, so that we can clearly see the numbers behind each trunk and how many each number has. (Excerpted from Baidu Encyclopedia)

Is the stem part of the tree ten digits (hundreds or thousands are also acceptable)? Top-down 9*? 9*? 8*? 3*

And leaves are the last number? For example, the top bar is 97? 96? 95~

What if it is a three-digit 205? Terrier 20? The leaves are 5

Four digits 1025? Is it 102? The leaves are 5

Five digits 13548? Is the stalk 1354? The leaf is 8.

And so on ~ statistics module of senior one ~ speak quickly in class. ...

Is it 1? Does it mean 10? The leaf is 2, is that 10+2= 12? This can only be said to be two digits, so the trunk is ten digits 1.

That leaves two? Equivalent to ten digits 1? Unit 2? It is 12.

But what if it is 10? So the stem is 1? The leaves are 0~

I hope I can help you, thank you!