Numbers array - thinking question

Question posted in Computer Software on 08 2009
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In an array of size n there are numbers that can repeat each other.
You need to write a program that checks whether all the numbers from 1-n appear in this array.

For example:










3

6

5

2

1












3

2

5

2

1

The result will be false


 











3

2

6

5

4

1

The result will be true
 
 
 
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