cracking the facebook coding interview
TRANSCRIPT
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Gayle L.McDowell | Founder / CEO
gayle in/gaylemcdgayle
Cracking the FacebookCoding InterviewI <3 Facebook!
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gayle in/gaylemcdgayleGayle Laakmann McDowell 2
Hi! I’m Gayle Laakmann McDowell
Author Interview Coach Interview Consulting
<dev>
</dev>
(CS)
(MBA)
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Gayle Laakmann McDowell 3gayle in/gaylemcdgayle
Yes! Slides are online!
Gayle.com Click “Speaking” Ctrl-F for “Facebook”
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Behavioral Questions
The soft squishy stuff.
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The Pitch / Resume Walk-Through
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Gayle Laakmann McDowell 6gayle in/gaylemcdgayle
Your Past Work
1 – 2 Hard Projects Hard / cool You were central Technical depth
All Past Work Challenges,
architecture, tradeoffs, mistakes, successes, motivations
What did YOU do?
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What
about
YOU?
Be PASSIONATE
Be KNOWLEDGEABLE
Be a GOOD TEAMMATE
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Technical QuestionsWhy why why why why why meeeee02
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What
ReallyHappens
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What
ReallyHappens
Knowledge Questions + Coding
Design/Scalability + Coding
Algorithms/Problem Solving + Coding
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Knowledge Questions
How do indices work in SQL?
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Knowledge Questions
If you list it, know it
If you don’t know it, admit it Derive it if
possible.
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Design
How would you design TinyURL?
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How
ToApproach
WWYDAW
hatouldouotork
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How
ToApproach
SKI
R
copeey componentsdentify issuesepair
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How
ToApproach
① Scope the Problem Ask questions Make appropriate
assumptions
② Define Key Components
Can be somewhat naïve
③ Identify Issues Bottlenecks, tradeoffs
④ Repair & Redesign
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How to Act
DRIVE Lead the
process Be open about
issues
TEAMWORK Be open to
feedback Tweak as
necessary
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How
To
Prepare
Read about design of major companies Twitter, Facebook,
Quora, Google, etc. Think about WHY
they’re designed that way
Learn/review key concepts Task queues,
databases, sharding, etc.
Practice questions
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Algorithm Preparation
Problem solving, not puzzles!
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Why?
Strong CS fundamentals
Analytical skills
Make tradeoffs
Push through hard problems
Communication
How you think
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Essential Knowledge
Data Structures
Algorithms Concepts
ArrayLists Merge Sort Big O Time
Hash Tables Quick Sort Big O Space
Trees (+ Tries) Breadth-First Search
Recursion
Graphs Depth-First Search
Memoization / Dynamic Programming
Stacks / Queues Binary Search
Heaps
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Preparation
Implement DS/Algorithms MASTER Big O Practice with interview questions Code on paper/whiteboard Mock interviews
PUSH YOURSELF!
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Solving Algorithms
How to… attempt to solve a hard problem
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What
is NOTexpected
To know the answers To solve immediately To code perfectly
(It’s nice. It just doesn’t
happen*.)
* Okay fine. It happened once, in 2000+ hiring packets.
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What
ISexpected
Be excited about hard problems
More than just “correct”
Drive! Keep trying when
stuck Write real code
Show me how you think!
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How
ToApproach
Cra
ckin
gTh
eC
odin
gIn
terv
iew
.com
“Reso
urc
es”
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step
1Listen (for clues)
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What’s the clue?
Anagram server Ex: rates -> aster, stare, taser,
tears
Clue: why is it on a server?
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step
2Draw an Example
Big Enough
General Purpose
+
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Ex: Intersection of Two Sorted Arrays
Most people draw something like this:
[1, 12, 15, 19][2, 12, 13, 20]
Too small Too special-case-y • same size, one common element, same
index
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Ex: Intersection of Two Sorted Arrays
Better:
[1, 12, 15, 19, 20, 21][2, 15, 17, 19, 21, 25,
27]
Big No special cases
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step
3Brute Force / Naive
Stupid & terrible is okay!
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step
4Optimize
Walk through
brute force
Look for optimizations
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Techniques to Develop Algorithms
OptimizeA. BUDB. Space/timeC. Do it yourself
SolveD. RecursionE. Solve
“incorrectly”F. Other data
structures
Push yourself!
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(A) Look for BUD
BottlenecksUnnecessary workDuplicated work
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What’s the bottleneck?
Ex: counting the intersection[1, 12, 15, 19, 20, 21][2, 15, 17, 19, 21, 25, 27]
Bottleneck: searching
B
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What’s unnecessary?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
Unnecessary: looking for d U
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What’s unnecessary?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
Unnecessary: looking for d U
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What’s duplicated?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
Duplicated: c, d pairs D
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What’s duplicated?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
Duplicated: c, d pairs D
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What’s duplicated?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
D
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What’s duplicated?
Ex: a3 + b3 = c3 + d3 (1 <= a, b, c, d <= 1000
D
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(B) Space/Time Tradeoffs
Hash tables & other data structures
Precomputing
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Space/Time Tradeoffs Hash tables
Find pairs with sum[5, 15, 8, 9, 3, 2, -1, 4], sum = 7pairs: (5, 2), (8, -1), (3, 4)
Put items into hash table
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Space/Time Tradeoffs Precomputing
Find rectangle at origin w biggest sum
6 5 -9 2 -2 -5 -2 7 3 -2 10 13 -8 -3 1 -2 Brute force: compute all
rectangles and sums
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Space/Time Tradeoffs Precomputing
Find rectangle with biggest sum 6 5 -9 2 -2 -5 -2 7 3 -2 10 13 -8 -3 1 -2
-+ + 10
=
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Space/Time Tradeoffs Precomputing
Find rectangle with biggest sum 6 5 -9 2 -2 -5 -2 7 3 -2 10 13 -8 -3 1 -2
-+ + 13
=
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(C) Do it yourself
Find permutations of s within b s = abbc b = babcabbacaabcbabcacbb
Find them! … now how did you actually do it?
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Techniques to Develop Algorithms
OptimizeA. BUDB. Space/timeC. Do it yourself
SolveD. RecursionE. Solve
“incorrectly”F. Other data
structures
Push yourself!
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(D) Recursion / Base Case & Build
Subsets of a set {} {} {a} {}, {a} {a, b} {}, {a}, {b}, {a, b} {a, b, c} …
Subsets of {S1…Sn-1} + Sn to each
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(E) Solve “incorrectly”
① Develop incorrect solution② Identify why precisely it’s
incorrect③ Repair④ (& Repeat)
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(E) Solve “incorrectly”
Random node in BST
Try: flip coin
Coin = Heads Branch Left
Coin = Tails Branch Right
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(E) Solve “incorrectly”
Random node in BST
Try: random number in {0, 1, 2}
R = 0 Branch Left
R = 2 Branch Right
R = 1 Return root
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(E) Solve “incorrectly”
Random node in BST
Try: Return root with 1/n probability Then flip coin (heads left, tails ->
right)
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(E) Solve “incorrectly”
Random node in BST
Try: pick random # 0 through n-1
R = 0 Return root
R > left.size Branch right
1 <= R <= left.size Branch left
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(F) Other Data Structures
Giving out phone numbers “I want any available number” “I want this number”
Try: sorted array? Sorted linked list? Hash table? BST?
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step
5Walk Through
Know the variablesand when they change
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step
6Write Beautiful Code
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How to Write Whiteboard Code
Modularized Error cases /
TODOs Good
variables
Write straight Top-left corner Use arrows if
needed
Language choice is up to you!
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Modularization
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step
7Testing
FIRST Analyze What’s it doing? Why? Anything that looks
weird? Error hot spots
THEN use test cases Small test cases Edge cases Bigger test cases
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Final Thoughts
And questions03
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It’s done
for areason!
Be a great teammate.
Be a great engineer.
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Yes! Slides are online!
Gayle.com Click “Speaking” Ctrl-F for “Facebook”
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Other Resources
Gayle.com
CareerCup.com
CrackingTheCodingInterview.com
Or, follow me online • facebook.com/gayle• twitter.com/gayle• gayle.com• [email protected]• quora.com