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Start Here — How To Use The Coding Challenges Forum
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1
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1
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April 21, 2026
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Flexible record store: ingest, aggregate, and schema discovery
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0
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1
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April 20, 2026
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Parse CSV and compute fees by payment status
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1
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April 20, 2026
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Inner join two datasets by a field: hash join
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April 20, 2026
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Pipeline: chainable filter, transform, select on records
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April 20, 2026
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Hierarchical string compression: run-length per segment
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April 20, 2026
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Failsafe retry with bug fix: reset attempts between calls
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1
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April 20, 2026
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Service registry: register, health status, and lookup
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April 20, 2026
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CSV dataset validation: type checks and uniqueness
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April 20, 2026
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Chat billing: merge overlapping intervals
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April 20, 2026
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Bike map: nearest station and radius search
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April 20, 2026
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Van Eck sequence: n-th term via last-seen index tracking
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April 20, 2026
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Two-city flight cost minimization: greedy sort by cost difference
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April 20, 2026
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Remove invalid parentheses: BFS for minimum removals
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2
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April 20, 2026
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Flatten a multilevel doubly linked list: iterative pointer reconnection
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1
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April 20, 2026
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Find root cause nodes from failure logs: in-degree zero detection
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April 20, 2026
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Round-robin tournament schedule: circle method rotation
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1
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April 20, 2026
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Top-K frequent elements data structure: counter with bucket sort
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April 20, 2026
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Check connectivity between two subway stations: BFS on undirected graph
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April 20, 2026
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Bucket values into boundary ranges: binary search classification
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April 20, 2026
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Add two numbers in forward-order linked lists: stack-based carry propagation
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April 20, 2026
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Weighted random sampling with insert and delete
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April 20, 2026
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Task scheduler with insert, delete, and priority execution
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April 20, 2026
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Regular expression matching: DP with dot and star
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1
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April 20, 2026
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Refactor a slow function: O(n³) duplicates finder to O(n)
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April 20, 2026
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Palindrome detection: two-pointer on filtered characters
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April 20, 2026
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Merge k sorted event streams: heap-based timeline merge
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April 20, 2026
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Merge k sorted arrays: min-heap with OO design
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April 20, 2026
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Maximum prefix plus suffix score: total sum plus max element
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April 20, 2026
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Maximum path sum in a binary tree: post-order DFS
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April 20, 2026
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