salmanx

# Julius Caesar protected his confidential information by encrypting it in a cipher. Caesar’s cipher rotated every letter
# in a string by a fixed number, K , making it unreadable by his enemies. Given a string, S , and a number, K ,
# encrypt S and print the resulting string.
# Note: The cipher only encrypts letters; symbols, such as − , remain unencrypted.
# Input Format
# The first line contains an integer, N , which is the length of the unencrypted string.
# The second line contains the unencrypted string, S .
# The third line contains the integer encryption key, K , which is the number of letters to rotate.
# Constraints
# 1 ≤ N ≤ 100

salmanx

# Sami’s spaceship crashed on Mars! She sends sequential SOS messages to Earth for help.
# Letters in some of the SOS messages are altered by cosmic radiation during transmission. Given the signal
# received by Earth as a string, S , determine how many letters of Sami’s SOS have been changed by radiation.

# Input Format
# There is one line of input: a single string, S .
# Note: As the original message is just SOS repeated n times, S ’s length will be a multiple of 3 .

# Constraints
# 1 ≤ |S| ≤ 99

salmanx

class FlattenArray
    def self.flattify(array,init=[])
        array.each do |a|
         if a.class==Array
            flattify(a,init)
         else
            init << a
         end
        end
      init

salmanx

PSQL

Magic words:

psql -U postgres

If run with -E flag, it will describe the underlaying queries of the \ commands (cool for learning!).

Most \d commands support additional param of __schema__.name__ and accept wildcards like *.*