Algolense
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Arrays & Hashing

Master array manipulation with hash maps, two pointers, and more.

Categories

All Problems●Sorting Algorithms●Searching Algorithms●Arrays & Hashing●Sliding Window●Linked Lists●Trees●Graphs●Dynamic Programming●Stacks & Queues●Heaps & Priority Queues●Backtracking●Trie & Advanced
3 problems available in this category.

Two Sum

easy

Interactive visualizer for the classic Two Sum problem. Learn how to solve it in O(n) time using a Hash Map.

●Arrays & Hashingarrayarrayhash-table
O(O(n))•O(O(n))
Visualize

3Sum

medium

Interactive visualizer for the 3Sum problem. Learn how to use Two Pointers and Sorting to find unique triplets that sum to zero in O(n²) time.

●Arrays & Hashingarrayarraytwo-pointers
O(O(n²))•O(O(1) or O(n))
Visualize

Best Time to Buy and Sell Stock

easy

Interactive visualization for the Best Time to Buy and Sell Stock algorithm. Learn the optimal O(n) approach using a single pass to maximize profit.

●Arrays & Hashingarray-barsarraydynamic-programming
O(O(n))•O(O(1))
Visualize