CareerCup

Given a string “SELECT c1,… FROM (SELECT c2,… FROM (…) WHERE c2=v2,…) WHERE c1=v1,…”, format to the following by inserting "\n" and "\t":
“SELECT
  c1,…
 FROM
  (
  SELECT
   c2,…
  FROM
   (
     …
   )
  WHERE
   c2=v2,…
  )
 WHERE
  c1=v1,…

How do find out the top trendings products on a last hour/day/monthly basis?

Given that we have access to a real-time stream of sold product ids.

How to add chat plug in in any website

Give an array A of n integers where 1 <= a[i] <= K.
Find out the length of the shortest sequence that can be constructed out of numbers 1, 2, .. k that is NOT a subsequence of A.
eg. A = [4, 2, 1, 2, 3, 3, 2, 4, 1], K = 4
All single digits appears. Each of the 16 double digit sequences, (1,1), (1, 2), (1, 3), (1, 4), (2, 1), (2, 2) ... appears. Because (1, 1, 2) doesn't appear, return 3.

# Given a set of strings, print them in Lexicographic order (dictionary/alphabetical order)
# Example,
# Input:
# “ABCDEF”, “AA”, “BEF”, “A”, “AABB”
# Output:
# “A”, “AA”, “AABB”, “ABCDEF”, “BEF”