Background: 3rd year at London University - Electrical Engineering.

Had 0 algo knowledge June 2019 - learnt most of it online first using runestone pythonds algo online course - also helenski java MOOC.

Learnt most of the topics by September. Now i have completed 70 easy, 58 medium, 2 hard.

Interviewed at a few places failed some, got some offers.

Cisco (Offer):

• OA: 2 Easy, 2 medium, 200 mins - simple sliding window, hashmap, array to graph.
• Video: Behavioural and going over OA, improvements etc.
• Onsite:
  Round 1 - Behavioural about projects CV, some q's about networking - what is TCP/IP.
  Round 2 - Easy - Compare extension of 2 strings, e.g. String 1 = ab/cd/eg.xyz -> ext = xyz compare this with String 2.
  Round 3 - Easy/Medium - String, 2 pointer question, first they asked to do it using extra memory but tthen made it harder by doing it in place.
  Round 4 - Convert from integer to base 5, remove node from linked list, merge 2 sorted arrays, find element from shifted sorted array

Bloomberg (Rejected):

• Phone: Longest substring no repeating chars + qs about inheritance OOP, garbage collection
• Onsite:
  Round 1: Min steps to generate number - on discuss page
  Round 2: System design - top 100 stocks
  Round 3: HR behavioural

Investment Bank (Offer):

• OA: Hackerrank - 4 qs - 1 hr - all easy
• Phone - Coderpad - 3 qs - First non repeating char, Calender recursion, Remove node from middle of LL.
• Onsite - 60 minutes of behavioural grilling.

Hedge Fund 1 (Reject):

• OA: Array prefix sum question
• Phone: Behavioural + OS
• Onsite: Round 1: Is Anagram + Group Anagram +DP

Hedge Fund 2 (Reject):

• OA, 1 hour, Brute force question - long time to code
• Phone - 1 hr Valid parenthesis + LRU cache

Amex (Reject):

• OA: 1 hr, OS MCQs, 2 sum variant using fractions
• Phone: First Non repeating char
• Rejected me but then offered to fast track interview me again but i denied it.

Overall, pretty annoyed by Bloomberg but now i have to choose either the investment bank or Cisco both pay £30k.