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Basic Calculator I — Stack for Sign and Parentheses
Evaluate a basic expression with +, -, and parentheses using a stack to save and restore sign context.
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Maximum Frequency Stack — Bucket-per-Frequency Design
Design a frequency stack with O(1) push and pop-max-frequency using a map of frequency to stack of elements.
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Find Median from Data Stream — Two Heaps
Find the median dynamically as numbers are added using two heaps: a max-heap for the lower half and min-heap for upper.
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Serialize and Deserialize Binary Tree — BFS Level Order
Serialize a binary tree to a string using BFS level-order and deserialize back using a queue for reconstruction.
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Trapping Rain Water — Monotonic Stack Horizontal Layer
Calculate trapped rainwater volume using a monotonic stack that computes water in horizontal layers as bars are processed.
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