Find the sum of the elements in the "second" diagonal
Is the Point in a Circle?
Check if number exists in vector
Decipher the number 4 - 3 keys - order [1 2 3 2 1 2 3 ......]
decipher the number 1 - same key for all digits :)
Find the efficiency
Cipher or Decipher the number according to the second input - 1 key for all digits
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