Unable to understand given Sample I/O

#1

8
4 5 2 2 1 3 5 5
ans=4
I am unable to understand how 4 is the answer

#2

4 5 2 2 1 3 5 5
Step 1 : 4 5 2 2 3 3 5 5
Step 2: 4 5 3 3 3 3 5 5
Step 3: 4 5 5 5 5 5 5 5
Step 4: 5 5 5 5 5 5 5 5

In 4 steps you can convert the given array into required form.

#3

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