Problem database last updated: June 20, 2025
6 problems · 0 Easy, 5 Medium, 1 Hard · Ranked #220 of 458
0 Easy
0% · avg 23%
5 Medium
83% · avg 59%
1 Hard
17% · avg 18%
Based on 6 reported problems, Moloco interviews are in line with industry averages - 17% Hard vs 18% overall. The majority (83%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, Moloco puts unusual emphasis on stack (33.3% of problems, 3.9x the industry average), two-pointers (33.3% of problems, 2.5x the industry average), array (100% of problems, 1.7x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (100%), two-pointers (33.3%), dynamic-programming (33.3%), stack (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Longest String Chain You are given an array of words where each word consists of lowercase English letters. | Medium | Very Likely | arrayhash-tabletwo-pointers | Solve |
Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining. | Hard | Very Likely | arraytwo-pointersdynamic-programming | Solve |
Design a Stack With Increment Operation Design a stack that supports increment operations on its elements. | Medium | Very Likely | arraystackdesign | Solve |
Number of Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Very Likely | arraydepth-first-searchbreadth-first-search | Solve |
Single Element in a Sorted Array You are given a sorted array consisting of only integers where every element appears exactly twice, except for one element which appears exactly once. | Medium | Very Likely | arraybinary-search | Solve |
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Given an array of integers nums and an integer limit, return the size of the longest non-empty subarray such that the absolute difference between any two elemen... | Medium | Very Likely | arrayqueuesliding-window | Solve |
Longest String Chain
SolveYou are given an array of words where each word consists of lowercase English letters.
Trapping Rain Water
SolveGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Design a Stack With Increment Operation
SolveDesign a stack that supports increment operations on its elements.
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Single Element in a Sorted Array
SolveYou are given a sorted array consisting of only integers where every element appears exactly twice, except for one element which appears exactly once.
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
SolveGiven an array of integers nums and an integer limit, return the size of the longest non-empty subarray such that the absolute difference between any two elemen...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Moloco interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Moloco interviews focus heavily on array, two-pointers, dynamic-programming problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. Moloco interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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Moloco has been reported to ask 6 distinct coding problems. The most common topics are array, two-pointers, dynamic-programming. 0 are Easy difficulty, 5 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 6 reported problems, Moloco interviews are in line with industry averages - 17% Hard vs 18% overall. 83% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, two-pointers, dynamic-programming. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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