Cracking a Common Python Interview Challenge Using Lists

As a wrap-up of our back-to-basics series, we’re exploring a common interview challenge where we utilize the set data structure in python to determine a missing integer.

The Challenge:
Given an array with all integers from 1 to n except for one, write a function to return the missing integer. This can be done in O(n) time complexity and O(1) space complexity.

Video Overview:
1:00 The problem
1:24 Examples
3:04 Coding a python solution
4:45 A naive solution
10:44 A space optimized solution
19:09 Recap

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What types of videos would you like to see next? Let us know in the comments.

Additional Resources:

[kavittta]

for i in range(min(list), max(list)):
if i not in list:
print(i)

[Kwolf]

I understood your explanations and you managed to keep my attention throughout the video, kudos!

[evandroLG]

I really enjoyed this serie, Lizi! Your explanations are just awesome!
Regarding the next serie, I would suggest go through Front-End System Design. There is not much good material on this subject.

[alexenrique]

for idx, num in enumerate(set(lst), 1):
if idx != num:
return ind

[priyal]

Front-End System Design related series please.

[Suyogshashank]

def missing_num(arr):

distinct_arr = set(arr)

arr_sum = sum(distinct_arr)

max_num = max(distinct_arr)


actual_sum_n = (max_num * (max_num+1)) // 2

miss_num = actual_sum_n - arr_sum

return miss_num

[amk]

competitive programming, like basic problem solving approach like greedy approach

[stevegonzales]

Data Engineering problems please. This is an ANTI PATTERN in Big Data. If you employed this to find a difference, your batch would take days or weeks. Data Engineering problems please.