4 views
23 Jan 2026
Task: create a List and add all given numbers in the same order....
5 views
23 Jan 2026
Task: remove duplicates from a list but keep first-seen order. Return the cleaned list....
5 views
23 Jan 2026
Task: return a map of number -> frequency from the given int array....
6 views
23 Jan 2026
Task: implement a small stack using Deque and support push/pop/peek....
4 views
23 Jan 2026
Task: process operations on a queue (offer and poll). Return final size....
7 views
23 Jan 2026
Task: return the first number that appears exactly once in the list, else return null....
5 views
23 Jan 2026
Task: return k numbers with highest frequency. If tie, any order is fine....
5 views
23 Jan 2026
Task: group numbers by (value % m) and return a map remainder -> list of numbers....
4 views
23 Jan 2026
Task: for each window of size k, return max. Use deque of indices....
5 views
23 Jan 2026
Task: sort Student by marks (desc), then id (asc)....
4 views
23 Jan 2026
Task: implement a small LRU cache using LinkedHashMap. Support get/put with capacity....
6 views
23 Jan 2026
Task: given n and edges, detect if there is a cycle (directed). Use DFS + recursion stack....
5 views
23 Jan 2026
Task: given intervals, merge overlapping ones and return merged list....
5 views
23 Jan 2026
Task: merge k sorted int arrays into one sorted array using a priority queue....
3 views
23 Jan 2026
Task: for each i, consider last k numbers ending at i. Return the max frequency seen in any window....
