41. First Missing Positive | Top 100 Interview DSA Questions | Java Solution with time complexity

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This is the most frequently asked interview question.
And has been asked in many top product based companies like #amazon, #microsoft etc.

#amazon #microsoft
  1. SDE Concepts in 10Mins - by Shrayansh
  2. First Missing Positive
  3. 41. First Missing Positive
  4. leetcode 41
  5. how to approach dsa questions
  6. concept and coding
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This is an amazing interview question with follow up question :
1. Find the kth missing positive in a sorted input.(Binary search)
2. Find the first Missing positive in an unsorted inputs (this question) great question to solve.
3. Find the missing number (from 0 to n)--->If we solve the above 2 question and come to this, this is very tricky but it's a simple math logic (n*(n+1)/2 -sum(input))

If we could give out thought process by mentioning trade offs for above 3 questions in an interview, no body can reject us!
Glad you came across this problem !

visase
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One more condition have to chk I guess,
If(numsArray[value -1] > 0) then only update it to negetive...
If all no are distinct then not req this condition.

surojitsantra
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Nice question and discussion around it.

Should we modify input array given to us ? If not, can we achieve O(n) TC and O(1) SC?

ketanlalcheta
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Thanks for this kind of content Shreyansh
Could you please add leetcode link for every question you are solving?

imrohan
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