Oracle · DSA

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SQL, DBMS internals, and classic DSA (trees + DP).

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1
Kth Largest Element in an Arraymedium
Heap / Quickselect 25m
LeetCode GeeksforGeeks HackerRank Codeforces
LeetCode GeeksforGeeks HackerRank Codeforces
2
Best Time to Buy and Sell Stockeasy
Arrays / DP 15m
LeetCode GeeksforGeeks HackerRank Codeforces
LeetCode GeeksforGeeks HackerRank Codeforces
3
Word Ladderhard
BFS 40m
LeetCode GeeksforGeeks HackerRank Codeforces
LeetCode GeeksforGeeks HackerRank Codeforces
4
Reverse Linked Listeasy
Linked List 15m
LeetCode GeeksforGeeks HackerRank Codeforces
LeetCode GeeksforGeeks HackerRank Codeforces
5
Median of Two Sorted Arrayshard
Binary Search 45m
LeetCode GeeksforGeeks HackerRank Codeforces
LeetCode GeeksforGeeks HackerRank Codeforces
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Curated Oracle problem with topic, difficulty, and practice links.
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