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Apptronik LeetCode Interview Questions

Practice 47 real coding problems frequently asked in Apptronik technical interviews. Master these questions to ace your next Apptronik software engineering interview.

7 Easy
31 Medium
9 Hard

Top Topics at Apptronik

ArrayStringHash TableSortingTwo Pointers

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Apptronik Interview Problems

ProblemDifficultyDiffFrequencyTopicsAction
Adding Spaces to a String
100%
MediumM
100%
ArrayTwo Pointers+2
Solve→
Find Score of an Array After Marking All Elements
96%
MediumM
96%
ArrayHash Table+3
Solve→
Find Median from Data Stream
91%
HardH
91%
Two PointersDesign+3
Solve→
Gas Station
83%
MediumM
83%
ArrayGreedy
Solve→
Majority Element
76%
EasyE
76%
ArrayHash Table+3
Solve→
Convert Sorted List to Binary Search Tree
75%
MediumM
75%
Linked ListDivide and Conquer+3
Solve→
Sort Colors
73%
MediumM
73%
ArrayTwo Pointers+1
Solve→
Minimum Operations to Make Character Frequencies Equal
73%
HardH
73%
Hash TableString+3
Solve→
Kth Largest Element in an Array
72%
MediumM
72%
ArrayDivide and Conquer+3
Solve→
Word Pattern II
68%
MediumM
68%
Hash TableString+1
Solve→
Lowest Common Ancestor of a Binary Tree
68%
MediumM
68%
TreeDepth-First Search+1
Solve→
Valid Palindrome III
67%
HardH
67%
StringDynamic Programming
Solve→
Zero Array Transformation I
67%
MediumM
67%
ArrayPrefix Sum
Solve→
Plus One
66%
EasyE
66%
ArrayMath
Solve→
Maximum Swap
66%
MediumM
66%
MathGreedy
Solve→
Diagonal Traverse
64%
MediumM
64%
ArrayMatrix+1
Solve→
Walls and Gates
63%
MediumM
63%
ArrayBreadth-First Search+1
Solve→
Remove All Adjacent Duplicates In String
62%
EasyE
62%
StringStack
Solve→
Valid Palindrome
62%
EasyE
62%
Two PointersString
Solve→
Clone Graph
61%
MediumM
61%
Hash TableDepth-First Search+2
Solve→
Pascal's Triangle
60%
EasyE
60%
ArrayDynamic Programming
Solve→
The kth Factor of n
60%
MediumM
60%
MathNumber Theory
Solve→
Friends Of Appropriate Ages
59%
MediumM
59%
ArrayTwo Pointers+2
Solve→
Merge Intervals
59%
MediumM
59%
ArraySorting
Solve→
Valid Number
57%
HardH
57%
String
Solve→

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Flood Fill
54%
EasyE
54%
ArrayDepth-First Search+2
Solve→
Check Completeness of a Binary Tree
52%
MediumM
52%
TreeBreadth-First Search+1
Solve→
Maximum Sum Circular Subarray
51%
MediumM
51%
ArrayDivide and Conquer+3
Solve→
Interval List Intersections
51%
MediumM
51%
ArrayTwo Pointers
Solve→
Open the Lock
49%
MediumM
49%
ArrayHash Table+2
Solve→
Merge k Sorted Lists
48%
HardH
48%
Linked ListDivide and Conquer+2
Solve→
Frequency of the Most Frequent Element
45%
MediumM
45%
ArrayBinary Search+4
Solve→
Expression Add Operators
45%
HardH
45%
MathString+1
Solve→
Add Two Numbers
45%
MediumM
45%
Linked ListMath+1
Solve→
Word Ladder II
41%
HardH
41%
Hash TableString+2
Solve→
Maximum Units on a Truck
41%
EasyE
41%
ArrayGreedy+1
Solve→
LFU Cache
40%
HardH
40%
Hash TableLinked List+2
Solve→
Search a 2D Matrix
40%
MediumM
40%
ArrayBinary Search+1
Solve→
Bus Routes
38%
HardH
38%
ArrayHash Table+1
Solve→
Spiral Matrix
37%
MediumM
37%
ArrayMatrix+1
Solve→
Valid Sudoku
32%
MediumM
32%
ArrayHash Table+1
Solve→
Maximum Product Subarray
30%
MediumM
30%
ArrayDynamic Programming
Solve→
Nested List Weight Sum
30%
MediumM
30%
Depth-First SearchBreadth-First Search
Solve→
String Compression
27%
MediumM
27%
Two PointersString
Solve→
Permutation in String
27%
MediumM
27%
Hash TableTwo Pointers+2
Solve→
Jump Game II
25%
MediumM
25%
ArrayDynamic Programming+1
Solve→
Design Tic-Tac-Toe
23%
MediumM
23%
ArrayHash Table+3
Solve→

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Frequently Asked Questions

What LeetCode problems does Apptronik ask in interviews?

Apptronik commonly asks 47 coding problems in technical interviews, including Adding Spaces to a String, Find Score of an Array After Marking All Elements, Find Median from Data Stream. The difficulty breakdown is 7 Easy, 31 Medium, and 9 Hard problems.

How should I prepare for a Apptronik coding interview?

Focus on the most frequently asked problems first, especially those with high frequency scores. Apptronik interviews typically emphasize Array and String. Practice explaining your thought process while coding.

What is the difficulty level of Apptronik coding interviews?

Based on our data, Apptronik interviews include 7 Easy (15%), 31 Medium (66%), and 9 Hard (19%) problems.

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