This is a Google OA question — don’t miss this opportunity
January 15, 2026 · 98 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)
1.
Reverse Linked List II
Data Structures & Algorithms
2.
Remove Duplicates from Sorted List II
Data Structures & Algorithms
Remove Duplicates from Sorted List II
3.
Kth Smallest Element in a BST
Data Structures & Algorithms
Kth Smallest Element in a BST
4.
Minimum Time Visiting All Points
Data Structures & Algorithms
5.
Insertion Sort List
Data Structures & Algorithms
Insertion Sort List
6.
Invert Binary Tree
Data Structures & Algorithms
Invert Binary Tree
7.
Check If Digits Are Equal in String After Operations I
Data Structures & Algorithms
8.
Capitalize the Title
Data Structures & Algorithms
Capitalize the Title
9.
Number of Steps to Reduce a Number to Zero
Data Structures & Algorithms
Number of Steps to Reduce a Number to Zero
10.
Kth Smallest Element in a BST
Data Structures & Algorithms
11.
Maximize Happiness of Selected Children
Data Structures & Algorithms
Maximize Happiness of Selected Children