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Firecode.io🔥

@firecodeio
Official X for Firecode.io. Coding Interview Prep - Done Right. See what the hype is about at firecode.io . Status: status.firecode.io
San Francisco, CA
firecode.io
Joined April 2015
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  • user avatar
    Firecode.io🔥
    @firecodeio
    Jul 20
    Facts
    user avatar
    Mrinal
    @Hi_Mrinal
    Jul 19
    The higher the salary bracket you are interviewing for the more chill the interview becomes
  • user avatar
    Firecode.io🔥
    @firecodeio
    May 26
    Binary Tree Max Path Sum: the recursive function returns node + max(left, right) to the parent, but tracks maxSum with node + left + right. two separate concerns. the path can turn at a node but can’t extend after turning. [-10,9,20,15,7] → 42, not 34.
    Image
    Optimal Path Sum in Binary Trees
    From firecode.io
  • user avatar
    Firecode.io🔥
    @firecodeio
    May 25
    Sort Colors trips most people on one thing: after swapping with blue, don't advance white. that element is unexamined. after swapping with red, advance both. it was already a 1. that's the Dutch National Flag algorithm. Apple, Google, Meta ask this.
    Image
    Color Segregation Challenge
    From firecode.io
  • user avatar
    Firecode.io🔥
    @firecodeio
    May 22
    Longest Palindromic Substring trips people on one thing: odd vs even palindromes. 'cbbd' → 'bb' requires the even-center check (expandAround i, i+1). only checking single chars gives you 'c', which is wrong. two expand calls per index, not one.
    Image
    Maximal Symmetric Substring
    From firecode.io
  • user avatar
    Firecode.io🔥
    @firecodeio
    May 21
    Combination Sum is the problem where backtracking clicks. add, recurse, pop. passing `start = i` not `i + 1` in the recursive call is what makes it combinations not permutations. without it, [2,3] and [3,2] both show up.
    Image
    Sum Combinations with Repeats
    From firecode.io
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