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  1. Prepare
  2. Security
  3. Functions
  4. Security Bijective Functions
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Security Bijective Functions

  • jm5nc
     + 0 comments

    quite hard to understand the question - only really became clear after stumbliing across the right answer - very easy once you get past the wordingof the explanation

    # Enter your code here. Read input from STDIN. Print output to STDOUT
n = int(input().strip())
arr = [int(i) for i in input().strip().split()]
ans = "YES"
for i in range(1,n+1):
    if i not in arr:
        ans = "NO"
print(ans)