Top 50 coding challenge Interview Questions
The most frequently asked coding challenge questions across all roles and companies, ranked by real interview frequency. Updated daily.
Find the longest substring without repeated characters using a sliding window and last-seen index map.
Find the longest substring without repeated characters using a sliding window and last-seen index map.
eBay
Microsoft
J.P. MorganReverse each word's characters while preserving the sentence's word order using a linear scan.
American Airlines
Pocket FmBBestPeers InfosystemImplement a per-client sliding-window rate limiter using queues and return whether each API request is allowed.
Robert Slack
Airbnb
DeliverooImplement FIFO queue behavior with two LIFO stacks while supporting enqueue and dequeue operations.
Roku
Adecco General Staffing
SyscoAdd two reverse-order numbers digit by digit and return their sum as a new linked list.
PayU
Warner Bros. DiscoveryReverse a singly linked list iteratively and recursively while preserving every node and returning the new head.
NetsuiteAAppLogic NetworksKKinaxisReverse a singly linked list in-place by rewiring its next pointers with O(n) time and O(1) extra space.
Annapurna Labs (U.S.)
Zebra Technologies
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