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This is a Google OA question — don’t miss this opportunity
January 15, 2026 • 8 reads
Summary
This post compiles a list of LeetCode problems that I have collected from recent online assessments (OA), which are useful for interview preparation.
Full Experience
Numbered List with Problem Names
These questions were collected from students who recently attended online assessments (OA).
LeetCode 92 – Reverse Linked List II
https://leetcode.com/problems/reverse-linked-list-ii/solutions/7494415/leetcode-92-reverse-linked-list-ii-simpl-7ovqLeetCode 82 – Remove Duplicates from Sorted List II
https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/solutions/7494419/leetcode-82-remove-duplicates-from-sorte-f0qtLeetCode 230 – Kth Smallest Element in a BST
https://leetcode.com/problems/kth-smallest-element-in-a-bst/solutions/7257854/leetcode-230-easy-to-understand-c-soluti-lqiwLeetCode 1266 – Minimum Time Visiting All Points
https://leetcode.com/problems/minimum-time-visiting-all-points/solutions/7489572/leetcode-1266-minimum-time-visiting-all-u5yyxLeetCode 147 – Insertion Sort List
https://leetcode.com/problems/insertion-sort-list/solutions/7493328/leetcode-147-insertion-sort-list-simple-exb7gLeetCode 226 – Invert Binary Tree
https://leetcode.com/problems/invert-binary-tree/solutions/6646546/recursive-tree-inversion-in-c-explained-eehpsLeetCode 3461 – Check If Digits Are Equal in String After Operations I
https://leetcode.com/problems/check-if-digits-are-equal-in-string-after-operations-i/solutions/7298018/leetcode-3461-check-if-digits-are-equal-h4amhLeetCode 2129 – Capitalize the Title
https://leetcode.com/problems/capitalize-the-title/solutions/7491145/leetcode-2129-capitalize-the-title-by-ra-g7bsLeetCode 1342 – Number of Steps to Reduce a Number to Zero
https://leetcode.com/problems/number-of-steps-to-reduce-a-number-to-zero/solutions/7159008/number-of-steps-to-reduce-a-number-to-ze-u7sxLeetCode 230 – Kth Smallest Element in a BST (Alternate Solution)
https://leetcode.com/problems/kth-smallest-element-in-a-bst/solutions/7257822/leetcode-230-kth-smallest-element-in-a-b-vk0xLeetCode 3075 – Maximize Happiness of Selected Children
https://leetcode.com/problems/maximize-happiness-of-selected-children/solutions/7437268/3075-on-log-n-greedy-solution-c-java-pyt-sxsiInterview Questions (11)
Q2
Remove Duplicates from Sorted List II
Data Structures & Algorithms
Q7
Check If Digits Are Equal in String After Operations I
Data Structures & Algorithms
Q9
Number of Steps to Reduce a Number to Zero
Data Structures & Algorithms