easyArrays & Hashing
Event Frequency Ledger
Summarize repeated event codes for a telemetry batch.
Practice challengeCodeArena challenge library
12 challenges match your filters.
easyArrays & Hashing
Scholarship Tag Counter
Count normalized scholarship tags for discovery ranking.
Practice challengemediumArrays & Hashing
Inventory Signal Index
Build a stable count index for marketplace inventory signals.
Practice challengehardArrays & Hashing
Assessment Answer Histogram
Count answer choices without losing case-sensitive distinctions.
Practice challengeeasyArrays & Hashing
Application Fee Pair
Find the earliest two fees that exactly match a budget.
Practice challengeeasyArrays & Hashing
Capacity Pair Finder
Locate the first compatible capacity pair for a deployment target.
Practice challengemediumArrays & Hashing
Course Credit Pair
Find two course-credit values that reach a graduation requirement.
Practice challengehardArrays & Hashing
Travel Cost Pair
Find two quoted costs that use the remaining travel allowance.
Practice challengeeasyArrays & Hashing
Deadline Interval Merge
Normalize overlapping admissions deadline windows.
Practice challengeeasyArrays & Hashing
Maintenance Window Merge
Merge overlapping platform maintenance periods.
Practice challengemediumArrays & Hashing
Interview Availability Merge
Consolidate overlapping interview availability blocks.
Practice challengehardArrays & Hashing
Visa Appointment Window Merge
Canonicalize overlapping appointment windows.
Practice challenge