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Course Schedule II — Topological Order via BFS
Return a valid course order using Kahn's BFS topological sort, or empty array if a cycle exists.
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Word Ladder — BFS Shortest Transformation Path
Find the shortest word transformation sequence using BFS where each step changes exactly one character.
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Basic Calculator II — Stack with Operator Precedence
Evaluate a string expression with +, -, *, / using a stack that handles operator precedence without parentheses.
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132 Pattern — Monotonic Stack from Right
Detect a 132 pattern (i < j < k, nums[i] < nums[k] < nums[j]) using a monotonic stack scanning right to left.
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Number of Visible People in Queue — Monotonic Stack
Count visible people in a queue for each person using a monotonic decreasing stack scanning right to left.
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