diff --git a/README.md b/README.md index 9c7841d..f1da8f4 100644 --- a/README.md +++ b/README.md @@ -130,6 +130,10 @@ Please keep it source-safe — no confidential screenshots or full proprietary s | **TikTok** | [Reverse Letters in Pairs](https://www.fastprep.io/problems/tiktok-reverse-letters-in-pairs) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-reverse-letters-in-pairs) | 🔥 Aug 26, 2026 | | **TikTok** | [Sort Matrix Borders](https://www.fastprep.io/problems/tiktok-sort-matrix-borders) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-sort-matrix-borders) | 🔥 Aug 25, 2026 | | **TikTok** | [Count Even-Digit Numbers](https://www.fastprep.io/problems/tiktok-count-even-digit-numbers) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-count-even-digit-numbers) | 🔥 Aug 25, 2026 | +| **ByteDance** | [Match Consecutive Word Boundaries (for mle also :)](https://www.fastprep.io/problems/bytedance-match-consecutive-word-boundaries) | Coding | [![Practice][p]](https://www.fastprep.io/problems/bytedance-match-consecutive-word-boundaries) | 🔥 Aug 25, 2026 | +| **ByteDance** | [Minimize Expression Value with Parentheses (for mle also :)](https://www.fastprep.io/problems/bytedance-minimize-expression-value-with-parentheses) | Coding | [![Practice][p]](https://www.fastprep.io/problems/bytedance-minimize-expression-value-with-parentheses) | 🔥 Aug 25, 2026 | +| **ByteDance** | [Leftmost Memory Block Allocator (for mle also :)](https://www.fastprep.io/problems/bytedance-leftmost-memory-block-allocator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/bytedance-leftmost-memory-block-allocator) | 🔥 Aug 25, 2026 | +| **ByteDance** | [Find Sum Pairs (for mle also :)](https://www.fastprep.io/problems/bytedance-find-sum-pairs) | Coding | [![Practice][p]](https://www.fastprep.io/problems/bytedance-find-sum-pairs) | 🔥 Aug 25, 2026 | | **Goldman Sachs** | [Maximum Ones After K Operations](https://www.fastprep.io/problems/goldman-sachs-maximum-ones-after-k-operations) | Coding | [![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-maximum-ones-after-k-operations) | 🔥 Aug 24, 2026 | | **Microsoft** | [Maximum Products by Budget](https://www.fastprep.io/problems/1.microsoft-maximum-products-by-budget) | Coding | [![Practice][p]](https://www.fastprep.io/problems/1.microsoft-maximum-products-by-budget) | 🔥 Aug 24, 2026 | | **TikTok** | [Repeated Grouped Digit Sum](https://www.fastprep.io/problems/tiktok-repeated-grouped-digit-sum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-repeated-grouped-digit-sum) | 🔥 Aug 24, 2026 | @@ -202,21 +206,21 @@ Please keep it source-safe — no confidential screenshots or full proprietary s | **OpenAI** | [Design a Distributed Crossword Solver](https://www.fastprep.io/system-design/distributed-crossword-solver-orchestration) | System design | [![Practice][p]](https://www.fastprep.io/system-design/distributed-crossword-solver-orchestration) | 🔥 Aug 13, 2026 | | **Meta** | [Design a Multimodal Public-Content Safety Platform](https://www.fastprep.io/system-design/multimodal-public-content-safety-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/multimodal-public-content-safety-platform) | 🔥 Aug 13, 2026 | | **Databricks** | [Online Bookseller Platform](https://www.fastprep.io/system-design/online-bookseller-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/online-bookseller-platform) | 🔥 Aug 13, 2026 | -| **Anthropic** | [Inference Engine (Fellow Program :D](https://www.fastprep.io/project-coding/anthropic-inference-engine-scheduler) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/anthropic-inference-engine-scheduler) | 🔥 Aug 12, 2026 | -| **Anthropic** | [Debug Extremely Randomized Trees (Fellow Program :)](https://www.fastprep.io/project-coding/anthropic-extremely-randomized-trees) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/anthropic-extremely-randomized-trees) | 🔥 Aug 12, 2026 | -| **DoorDash / Robinhood / Snowflake / Postman / Figma** | [Design a Scheduled Job Execution System](https://www.fastprep.io/system-design/scheduled-job-execution-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/scheduled-job-execution-system) | 🔥 Aug 12, 2026 | -| **OpenAI / The D. E. Shaw Group / Zoox** | [Design an Online Payment Processing System](https://www.fastprep.io/system-design/online-payment-processing-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/online-payment-processing-system) | 🔥 Aug 12, 2026 | -| **Figma** | [Design Comments for a Collaborative Canvas](https://www.fastprep.io/system-design/collaborative-canvas-comments) | System design | [![Practice][p]](https://www.fastprep.io/system-design/collaborative-canvas-comments) | 🔥 Aug 12, 2026 | -| **OpenAI** | [Design an Online Chess Platform](https://www.fastprep.io/system-design/online-chess-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/online-chess-platform) | 🔥 Aug 12, 2026 | -| **Anthropic** | [Design a Model-Weight Deployment Platform](https://www.fastprep.io/system-design/model-weight-deployment-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/model-weight-deployment-platform) | 🔥 Aug 12, 2026 | -| **Anthropic / Snap Inc.** | [One-to-One Chat Service](https://www.fastprep.io/system-design/one-to-one-chat-service) | System design | [![Practice][p]](https://www.fastprep.io/system-design/one-to-one-chat-service) | 🔥 Aug 12, 2026 | -| **Goldman Sachs** | [Design a Live-Stream Chat System](https://www.fastprep.io/system-design/live-stream-chat-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/live-stream-chat-system) | 🔥 Aug 12, 2026 | -| **Goldman Sachs** | [Design an In-Memory Job Scheduler](https://www.fastprep.io/low-level-design/in-memory-job-scheduler) | Low-level design | [![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-job-scheduler) | 🔥 Aug 12, 2026 | -| **Coinbase** | [Design a Brokerage Order Processing System](https://www.fastprep.io/system-design/brokerage-order-processing-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/brokerage-order-processing-system) | 🔥 Aug 12, 2026 | -| **ByteDance** | [Design a Multimedia Content Moderation Platform](https://www.fastprep.io/system-design/multimedia-content-moderation-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/multimedia-content-moderation-platform) | 🔥 Aug 12, 2026 | -| **Mercor** | [Design a Unique Username Registration System](https://www.fastprep.io/system-design/unique-username-registration-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/unique-username-registration-system) | 🔥 Aug 12, 2026 | -| **Shopify** | [Design an Extensible Text Editor](https://www.fastprep.io/low-level-design/extensible-text-editor) | Low-level design | [![Practice][p]](https://www.fastprep.io/low-level-design/extensible-text-editor) | 🔥 Aug 12, 2026 | -| **Snap Inc.** | [Build a Persistent Chat Backend](https://www.fastprep.io/project-coding/persistent-chat-backend) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/persistent-chat-backend) | 🔥 Aug 12, 2026 | +| **Anthropic** | [Inference Engine (Fellow Program :D](https://www.fastprep.io/project-coding/anthropic-inference-engine-scheduler) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/anthropic-inference-engine-scheduler) | 🆕 Aug 12, 2026 | +| **Anthropic** | [Debug Extremely Randomized Trees (Fellow Program :)](https://www.fastprep.io/project-coding/anthropic-extremely-randomized-trees) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/anthropic-extremely-randomized-trees) | 🆕 Aug 12, 2026 | +| **DoorDash / Robinhood / Snowflake / Postman / Figma** | [Design a Scheduled Job Execution System](https://www.fastprep.io/system-design/scheduled-job-execution-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/scheduled-job-execution-system) | 🆕 Aug 12, 2026 | +| **OpenAI / The D. E. Shaw Group / Zoox** | [Design an Online Payment Processing System](https://www.fastprep.io/system-design/online-payment-processing-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/online-payment-processing-system) | 🆕 Aug 12, 2026 | +| **Figma** | [Design Comments for a Collaborative Canvas](https://www.fastprep.io/system-design/collaborative-canvas-comments) | System design | [![Practice][p]](https://www.fastprep.io/system-design/collaborative-canvas-comments) | 🆕 Aug 12, 2026 | +| **OpenAI** | [Design an Online Chess Platform](https://www.fastprep.io/system-design/online-chess-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/online-chess-platform) | 🆕 Aug 12, 2026 | +| **Anthropic** | [Design a Model-Weight Deployment Platform](https://www.fastprep.io/system-design/model-weight-deployment-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/model-weight-deployment-platform) | 🆕 Aug 12, 2026 | +| **Anthropic / Snap Inc.** | [One-to-One Chat Service](https://www.fastprep.io/system-design/one-to-one-chat-service) | System design | [![Practice][p]](https://www.fastprep.io/system-design/one-to-one-chat-service) | 🆕 Aug 12, 2026 | +| **Goldman Sachs** | [Design a Live-Stream Chat System](https://www.fastprep.io/system-design/live-stream-chat-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/live-stream-chat-system) | 🆕 Aug 12, 2026 | +| **Goldman Sachs** | [Design an In-Memory Job Scheduler](https://www.fastprep.io/low-level-design/in-memory-job-scheduler) | Low-level design | [![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-job-scheduler) | 🆕 Aug 12, 2026 | +| **Coinbase** | [Design a Brokerage Order Processing System](https://www.fastprep.io/system-design/brokerage-order-processing-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/brokerage-order-processing-system) | 🆕 Aug 12, 2026 | +| **ByteDance** | [Design a Multimedia Content Moderation Platform](https://www.fastprep.io/system-design/multimedia-content-moderation-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/multimedia-content-moderation-platform) | 🆕 Aug 12, 2026 | +| **Mercor** | [Design a Unique Username Registration System](https://www.fastprep.io/system-design/unique-username-registration-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/unique-username-registration-system) | 🆕 Aug 12, 2026 | +| **Shopify** | [Design an Extensible Text Editor](https://www.fastprep.io/low-level-design/extensible-text-editor) | Low-level design | [![Practice][p]](https://www.fastprep.io/low-level-design/extensible-text-editor) | 🆕 Aug 12, 2026 | +| **Snap Inc.** | [Build a Persistent Chat Backend](https://www.fastprep.io/project-coding/persistent-chat-backend) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/persistent-chat-backend) | 🆕 Aug 12, 2026 | | **Snowflake** | [Design a Fault-Tolerant Cloud Queue Service](https://www.fastprep.io/system-design/fault-tolerant-cloud-queue-service) | System design | [![Practice][p]](https://www.fastprep.io/system-design/fault-tolerant-cloud-queue-service) | 🆕 Aug 11, 2026 | | **Apple** | [Design a Mobile Application Event Collection API](https://www.fastprep.io/system-design/mobile-application-event-collection-api) | System design | [![Practice][p]](https://www.fastprep.io/system-design/mobile-application-event-collection-api) | 🆕 Aug 11, 2026 | | **Rippling** | [Design a Room-Type Hotel Booking System](https://www.fastprep.io/system-design/room-type-hotel-booking-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/room-type-hotel-booking-system) | 🆕 Aug 11, 2026 | @@ -555,73 +559,73 @@ Please keep it source-safe — no confidential screenshots or full proprietary s | **Salesforce** | [Design a Rental Car Reservation System](https://www.fastprep.io/system-design/rental-car-reservation-system) | System design | [![Practice][p]](https://www.fastprep.io/system-design/rental-car-reservation-system) | 🆕 Jul 14, 2026 | | **Salesforce** | [Design a Third-Party SaaS Integration Platform](https://www.fastprep.io/system-design/third-party-saas-integration-platform) | System design | [![Practice][p]](https://www.fastprep.io/system-design/third-party-saas-integration-platform) | 🆕 Jul 14, 2026 | | **New Relic** | [Product of Array Except Self](https://www.fastprep.io/problems/new-relic-product-of-array-except-self) | Coding | [![Practice][p]](https://www.fastprep.io/problems/new-relic-product-of-array-except-self) | 🆕 Jul 13, 2026 | -| **OpenAI** | [CIDR IPv4 Range Iterator](https://www.fastprep.io/problems/openai-cidr-ipv4-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-cidr-ipv4-iterator) | 🆕 Jul 12, 2026 | -| **OpenAI** | [IPv4 Forward Iterator](https://www.fastprep.io/problems/openai-ipv4-forward-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ipv4-forward-iterator) | 🆕 Jul 12, 2026 | -| **OpenAI** | [IPv4 Reverse Iterator](https://www.fastprep.io/problems/openai-ipv4-reverse-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ipv4-reverse-iterator) | 🆕 Jul 12, 2026 | -| **OpenAI** | [Convert an IPv4 Range to Minimal CIDR Blocks](https://www.fastprep.io/problems/openai-ip-range-to-cidr) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ip-range-to-cidr) | 🆕 Jul 12, 2026 | -| **OpenAI** | [Toy Language Generic Return-Type Inference](https://www.fastprep.io/problems/openai-toy-language-return-type-inference) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-toy-language-return-type-inference) | 🆕 Jul 12, 2026 | -| **OpenAI** | [Count Matching Regions in Two Binary Grids](https://www.fastprep.io/problems/openai-count-matching-grid-regions) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-count-matching-grid-regions) | 🆕 Jul 12, 2026 | -| **OpenAI** | [Largest Square Subgrid Under a Sum Limit](https://www.fastprep.io/problems/openai-largest-square-subgrid-under-sum-limit) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-largest-square-subgrid-under-sum-limit) | 🆕 Jul 12, 2026 | -| **OpenAI** | [Backpropagation Through Sort and Median](https://www.fastprep.io/problems/openai-backpropagation-through-sort-and-median) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-backpropagation-through-sort-and-median) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Repair the Bootloader Program](https://www.fastprep.io/problems/anthropic-repair-bootloader-program) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-repair-bootloader-program) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Normalize a DNS Domain Name](https://www.fastprep.io/problems/anthropic-normalize-dns-name) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-normalize-dns-name) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Worker Management, Part 1: Office Registration](https://www.fastprep.io/problems/anthropic-worker-management-level-1) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-1) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Worker Management, Part 2: Top Workers](https://www.fastprep.io/problems/anthropic-worker-management-level-2) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-2) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Worker Management, Part 3: Promotions and Salary](https://www.fastprep.io/problems/anthropic-worker-management-level-3) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-3) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Worker Management, Part 4: Double-Paid Intervals](https://www.fastprep.io/problems/anthropic-worker-management-level-4) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-4) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Cloud Storage Compression and Decompression](https://www.fastprep.io/problems/anthropic-cloud-storage-compression) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-compression) | 🆕 Jul 12, 2026 | -| **Anthropic** | [In-Memory Database Historical Lookup](https://www.fastprep.io/problems/anthropic-in-memory-database-historical-lookup) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-in-memory-database-historical-lookup) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Banking Pending Transfer Acceptance](https://www.fastprep.io/problems/anthropic-banking-pending-transfer-acceptance) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-banking-pending-transfer-acceptance) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Cloud Storage File Versioning](https://www.fastprep.io/problems/anthropic-cloud-storage-file-versioning) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-file-versioning) | 🆕 Jul 12, 2026 | -| **Anthropic** | [Cloud Storage Prefix Trash and Restore](https://www.fastprep.io/problems/anthropic-cloud-storage-prefix-trash) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-prefix-trash) | 🆕 Jul 12, 2026 | -| **Amazon** | [Number of Islands II](https://www.fastprep.io/problems/amazon-number-of-islands-ii) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-number-of-islands-ii) | 🆕 Jul 12, 2026 | -| **Amazon** | [Course Schedule](https://www.fastprep.io/problems/amazon-course-schedule) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-course-schedule) | 🆕 Jul 12, 2026 | -| **Amazon** | [Maximum Length-K Window Sum over Sparse Segments](https://www.fastprep.io/problems/amazon-maximum-k-window-sum-over-sparse-segments) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-k-window-sum-over-sparse-segments) | 🆕 Jul 12, 2026 | -| **Amazon** | [Maximum Sum of Heights](https://www.fastprep.io/problems/amazon-maximum-sum-of-heights) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-sum-of-heights) | 🆕 Jul 12, 2026 | -| **Amazon** | [Longest Palindromic Subsequence](https://www.fastprep.io/problems/amazon-longest-palindromic-subsequence) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-longest-palindromic-subsequence) | 🆕 Jul 12, 2026 | -| **Amazon** | [Group Anagrams](https://www.fastprep.io/problems/amazon-group-anagrams) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-group-anagrams) | 🆕 Jul 12, 2026 | -| **Amazon** | [Maximal Square](https://www.fastprep.io/problems/amazon-maximal-square) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximal-square) | 🆕 Jul 12, 2026 | -| **Amazon** | [Sliding Window Maximum](https://www.fastprep.io/problems/amazon-sliding-window-maximum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-sliding-window-maximum) | 🆕 Jul 12, 2026 | -| **Agoda** | [3Sum](https://www.fastprep.io/problems/agoda-three-sum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/agoda-three-sum) | 🆕 Jul 12, 2026 | -| **JP Morgan** | [Bitwise XOR Subsequences](https://www.fastprep.io/problems/jpmorgan-bitwise-xor-subsequences) | Coding | [![Practice][p]](https://www.fastprep.io/problems/jpmorgan-bitwise-xor-subsequences) | 🆕 Jul 12, 2026 | -| **Stripe** | [Deployment Window Scheduler](https://www.fastprep.io/problems/stripe-deployment-window-scheduler) | Coding | [![Practice][p]](https://www.fastprep.io/problems/stripe-deployment-window-scheduler) | 🆕 Jul 12, 2026 | -| **TikTok** | [Obstacle Placement Queries](https://www.fastprep.io/problems/tiktok-obstacle-placement-queries) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-obstacle-placement-queries) | 🆕 Jul 12, 2026 | -| **Upstart** | [Coordinate Bounding Box](https://www.fastprep.io/problems/upstart-coordinate-bounding-box) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-coordinate-bounding-box) | 🆕 Jul 12, 2026 | -| **Upstart** | [Increase Exclamations and Convert Periods](https://www.fastprep.io/problems/upstart-transform-punctuation) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-transform-punctuation) | 🆕 Jul 12, 2026 | -| **Upstart** | [Interleave Equal-Length Strings by Column](https://www.fastprep.io/problems/upstart-interleave-equal-length-strings) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-interleave-equal-length-strings) | 🆕 Jul 12, 2026 | -| **Upstart** | [Scale Ingredient Quantities](https://www.fastprep.io/problems/upstart-scale-ingredient-quantities) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-scale-ingredient-quantities) | 🆕 Jul 12, 2026 | -| **IDFC** | [Find All People With Secret](https://www.fastprep.io/problems/idfc-find-all-people-with-secret) | Coding | [![Practice][p]](https://www.fastprep.io/problems/idfc-find-all-people-with-secret) | 🆕 Jul 12, 2026 | -| **Optiver** | [Power Cell Bank](https://www.fastprep.io/problems/optiver-power-cell-bank) | Coding | [![Practice][p]](https://www.fastprep.io/problems/optiver-power-cell-bank) | 🆕 Jul 12, 2026 | -| **DRW** | [Doctor Appointment Slot Assignment](https://www.fastprep.io/problems/drw-doctor-appointment-slot-assignment) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-doctor-appointment-slot-assignment) | 🆕 Jul 12, 2026 | -| **DRW** | [Maximum Even-Sum Neighboring Pairs](https://www.fastprep.io/problems/drw-maximum-even-sum-neighboring-pairs) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-maximum-even-sum-neighboring-pairs) | 🆕 Jul 12, 2026 | -| **DRW** | [Minimize Maximum Group Difference](https://www.fastprep.io/problems/drw-minimize-maximum-group-difference) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-minimize-maximum-group-difference) | 🆕 Jul 12, 2026 | -| **Goldman Sachs** | [Cheapest Flights Within K Stops](https://www.fastprep.io/problems/goldman-sachs-cheapest-flights-within-k-stops) | Coding | [![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-cheapest-flights-within-k-stops) | 🆕 Jul 12, 2026 | -| **Goldman Sachs** | [Word Ladder](https://www.fastprep.io/problems/goldman-sachs-word-ladder) | Coding | [![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-word-ladder) | 🆕 Jul 12, 2026 | -| **Rippling** | [Delivery Cost Tracker](https://www.fastprep.io/problems/rippling-delivery-cost-tracker) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-delivery-cost-tracker) | 🆕 Jul 12, 2026 | -| **Rippling** | [Corporate Card Expense Rules](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine) | 🆕 Jul 12, 2026 | -| **Rippling** | [Camel Cards](https://www.fastprep.io/problems/rippling-camel-cards) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-camel-cards) | 🆕 Jul 12, 2026 | -| **Rippling** | [Article Vote Tracker](https://www.fastprep.io/problems/rippling-article-vote-tracker) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-article-vote-tracker) | 🆕 Jul 12, 2026 | -| **Rippling** | [Employee Resource Access Management](https://www.fastprep.io/problems/rippling-employee-access-management) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-employee-access-management) | 🆕 Jul 12, 2026 | -| **Rippling** | [Limit an Organization Tree's Height](https://www.fastprep.io/problems/rippling-org-tree-height-control) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-org-tree-height-control) | 🆕 Jul 12, 2026 | -| **Rippling** | [Distributed System Recovery](https://www.fastprep.io/problems/rippling-distributed-system-recovery) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-distributed-system-recovery) | 🆕 Jul 12, 2026 | -| **Rippling** | [Server Upgrade Planning](https://www.fastprep.io/problems/rippling-server-upgrade-planning) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-server-upgrade-planning) | 🆕 Jul 12, 2026 | -| **Rippling** | [Shortest Substring](https://www.fastprep.io/problems/rippling-shortest-substring) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-shortest-substring) | 🆕 Jul 12, 2026 | -| **Rippling** | [Song Play Analytics](https://www.fastprep.io/problems/rippling-song-play-analytics) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-song-play-analytics) | 🆕 Jul 12, 2026 | -| **Rippling** | [Lexicographically Minimum Stack Encryption](https://www.fastprep.io/problems/rippling-lexicographically-minimum-encryption) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-lexicographically-minimum-encryption) | 🆕 Jul 12, 2026 | -| **Rippling** | [Minimum Account Settlements](https://www.fastprep.io/problems/rippling-minimum-account-settlements) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-minimum-account-settlements) | 🆕 Jul 12, 2026 | -| **Rippling** | [Matrix Region Sum](https://www.fastprep.io/problems/rippling-matrix-block-sum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-matrix-block-sum) | 🆕 Jul 12, 2026 | -| **Rippling** | [Maximum XOR Elimination Score](https://www.fastprep.io/problems/rippling-maximum-xor-elimination-score) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-maximum-xor-elimination-score) | 🆕 Jul 12, 2026 | -| **Rippling** | [Prime Tree City Labelings](https://www.fastprep.io/problems/rippling-prime-tree-labelings) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-prime-tree-labelings) | 🆕 Jul 12, 2026 | -| **Zomato / Eternal** | [Jump Game IV](https://www.fastprep.io/problems/zomato-jump-game-iv) | Coding | [![Practice][p]](https://www.fastprep.io/problems/zomato-jump-game-iv) | 🆕 Jul 12, 2026 | -| **IndiaMART** | [Reverse a String](https://www.fastprep.io/problems/indiamart-reverse-string) | Coding | [![Practice][p]](https://www.fastprep.io/problems/indiamart-reverse-string) | 🆕 Jul 12, 2026 | -| **Moody's** | [Longest Subarray with At Most Two Distinct Values](https://www.fastprep.io/problems/moodys-longest-subarray-at-most-two-distinct) | Coding | [![Practice][p]](https://www.fastprep.io/problems/moodys-longest-subarray-at-most-two-distinct) | 🆕 Jul 12, 2026 | -| **MulticoreWare** | [Minimum Coin Change](https://www.fastprep.io/problems/multicoreware-minimum-coin-change) | Coding | [![Practice][p]](https://www.fastprep.io/problems/multicoreware-minimum-coin-change) | 🆕 Jul 12, 2026 | -| **MulticoreWare** | [Second Distinct Largest Element](https://www.fastprep.io/problems/multicoreware-second-distinct-largest-element) | Coding | [![Practice][p]](https://www.fastprep.io/problems/multicoreware-second-distinct-largest-element) | 🆕 Jul 12, 2026 | -| **Shipsy** | [Largest Rectangle in Histogram](https://www.fastprep.io/problems/shipsy-largest-rectangle-in-histogram) | Coding | [![Practice][p]](https://www.fastprep.io/problems/shipsy-largest-rectangle-in-histogram) | 🆕 Jul 12, 2026 | -| **Stryker** | [Squares of a Sorted Array](https://www.fastprep.io/problems/stryker-squares-of-a-sorted-array) | Coding | [![Practice][p]](https://www.fastprep.io/problems/stryker-squares-of-a-sorted-array) | 🆕 Jul 12, 2026 | -| **Hive** | [Validate a Directed Edge Addition](https://www.fastprep.io/problems/hive-validate-directed-edge-addition) | Coding | [![Practice][p]](https://www.fastprep.io/problems/hive-validate-directed-edge-addition) | 🆕 Jul 12, 2026 | -| **Robinhood** | [Word Frequency in a Large Text](https://www.fastprep.io/problems/robinhood-word-frequency-in-large-text) | Coding | [![Practice][p]](https://www.fastprep.io/problems/robinhood-word-frequency-in-large-text) | 🆕 Jul 12, 2026 | -| **Amazon** | [Repair recurring payments in the Wallet backend](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments) | 🆕 Jul 12, 2026 | +| **OpenAI** | [CIDR IPv4 Range Iterator](https://www.fastprep.io/problems/openai-cidr-ipv4-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-cidr-ipv4-iterator) | Jul 12, 2026 | +| **OpenAI** | [IPv4 Forward Iterator](https://www.fastprep.io/problems/openai-ipv4-forward-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ipv4-forward-iterator) | Jul 12, 2026 | +| **OpenAI** | [IPv4 Reverse Iterator](https://www.fastprep.io/problems/openai-ipv4-reverse-iterator) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ipv4-reverse-iterator) | Jul 12, 2026 | +| **OpenAI** | [Convert an IPv4 Range to Minimal CIDR Blocks](https://www.fastprep.io/problems/openai-ip-range-to-cidr) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-ip-range-to-cidr) | Jul 12, 2026 | +| **OpenAI** | [Toy Language Generic Return-Type Inference](https://www.fastprep.io/problems/openai-toy-language-return-type-inference) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-toy-language-return-type-inference) | Jul 12, 2026 | +| **OpenAI** | [Count Matching Regions in Two Binary Grids](https://www.fastprep.io/problems/openai-count-matching-grid-regions) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-count-matching-grid-regions) | Jul 12, 2026 | +| **OpenAI** | [Largest Square Subgrid Under a Sum Limit](https://www.fastprep.io/problems/openai-largest-square-subgrid-under-sum-limit) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-largest-square-subgrid-under-sum-limit) | Jul 12, 2026 | +| **OpenAI** | [Backpropagation Through Sort and Median](https://www.fastprep.io/problems/openai-backpropagation-through-sort-and-median) | Coding | [![Practice][p]](https://www.fastprep.io/problems/openai-backpropagation-through-sort-and-median) | Jul 12, 2026 | +| **Anthropic** | [Repair the Bootloader Program](https://www.fastprep.io/problems/anthropic-repair-bootloader-program) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-repair-bootloader-program) | Jul 12, 2026 | +| **Anthropic** | [Normalize a DNS Domain Name](https://www.fastprep.io/problems/anthropic-normalize-dns-name) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-normalize-dns-name) | Jul 12, 2026 | +| **Anthropic** | [Worker Management, Part 1: Office Registration](https://www.fastprep.io/problems/anthropic-worker-management-level-1) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-1) | Jul 12, 2026 | +| **Anthropic** | [Worker Management, Part 2: Top Workers](https://www.fastprep.io/problems/anthropic-worker-management-level-2) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-2) | Jul 12, 2026 | +| **Anthropic** | [Worker Management, Part 3: Promotions and Salary](https://www.fastprep.io/problems/anthropic-worker-management-level-3) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-3) | Jul 12, 2026 | +| **Anthropic** | [Worker Management, Part 4: Double-Paid Intervals](https://www.fastprep.io/problems/anthropic-worker-management-level-4) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-worker-management-level-4) | Jul 12, 2026 | +| **Anthropic** | [Cloud Storage Compression and Decompression](https://www.fastprep.io/problems/anthropic-cloud-storage-compression) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-compression) | Jul 12, 2026 | +| **Anthropic** | [In-Memory Database Historical Lookup](https://www.fastprep.io/problems/anthropic-in-memory-database-historical-lookup) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-in-memory-database-historical-lookup) | Jul 12, 2026 | +| **Anthropic** | [Banking Pending Transfer Acceptance](https://www.fastprep.io/problems/anthropic-banking-pending-transfer-acceptance) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-banking-pending-transfer-acceptance) | Jul 12, 2026 | +| **Anthropic** | [Cloud Storage File Versioning](https://www.fastprep.io/problems/anthropic-cloud-storage-file-versioning) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-file-versioning) | Jul 12, 2026 | +| **Anthropic** | [Cloud Storage Prefix Trash and Restore](https://www.fastprep.io/problems/anthropic-cloud-storage-prefix-trash) | Coding | [![Practice][p]](https://www.fastprep.io/problems/anthropic-cloud-storage-prefix-trash) | Jul 12, 2026 | +| **Amazon** | [Number of Islands II](https://www.fastprep.io/problems/amazon-number-of-islands-ii) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-number-of-islands-ii) | Jul 12, 2026 | +| **Amazon** | [Course Schedule](https://www.fastprep.io/problems/amazon-course-schedule) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-course-schedule) | Jul 12, 2026 | +| **Amazon** | [Maximum Length-K Window Sum over Sparse Segments](https://www.fastprep.io/problems/amazon-maximum-k-window-sum-over-sparse-segments) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-k-window-sum-over-sparse-segments) | Jul 12, 2026 | +| **Amazon** | [Maximum Sum of Heights](https://www.fastprep.io/problems/amazon-maximum-sum-of-heights) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-sum-of-heights) | Jul 12, 2026 | +| **Amazon** | [Longest Palindromic Subsequence](https://www.fastprep.io/problems/amazon-longest-palindromic-subsequence) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-longest-palindromic-subsequence) | Jul 12, 2026 | +| **Amazon** | [Group Anagrams](https://www.fastprep.io/problems/amazon-group-anagrams) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-group-anagrams) | Jul 12, 2026 | +| **Amazon** | [Maximal Square](https://www.fastprep.io/problems/amazon-maximal-square) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-maximal-square) | Jul 12, 2026 | +| **Amazon** | [Sliding Window Maximum](https://www.fastprep.io/problems/amazon-sliding-window-maximum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/amazon-sliding-window-maximum) | Jul 12, 2026 | +| **Agoda** | [3Sum](https://www.fastprep.io/problems/agoda-three-sum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/agoda-three-sum) | Jul 12, 2026 | +| **JP Morgan** | [Bitwise XOR Subsequences](https://www.fastprep.io/problems/jpmorgan-bitwise-xor-subsequences) | Coding | [![Practice][p]](https://www.fastprep.io/problems/jpmorgan-bitwise-xor-subsequences) | Jul 12, 2026 | +| **Stripe** | [Deployment Window Scheduler](https://www.fastprep.io/problems/stripe-deployment-window-scheduler) | Coding | [![Practice][p]](https://www.fastprep.io/problems/stripe-deployment-window-scheduler) | Jul 12, 2026 | +| **TikTok** | [Obstacle Placement Queries](https://www.fastprep.io/problems/tiktok-obstacle-placement-queries) | Coding | [![Practice][p]](https://www.fastprep.io/problems/tiktok-obstacle-placement-queries) | Jul 12, 2026 | +| **Upstart** | [Coordinate Bounding Box](https://www.fastprep.io/problems/upstart-coordinate-bounding-box) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-coordinate-bounding-box) | Jul 12, 2026 | +| **Upstart** | [Increase Exclamations and Convert Periods](https://www.fastprep.io/problems/upstart-transform-punctuation) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-transform-punctuation) | Jul 12, 2026 | +| **Upstart** | [Interleave Equal-Length Strings by Column](https://www.fastprep.io/problems/upstart-interleave-equal-length-strings) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-interleave-equal-length-strings) | Jul 12, 2026 | +| **Upstart** | [Scale Ingredient Quantities](https://www.fastprep.io/problems/upstart-scale-ingredient-quantities) | Coding | [![Practice][p]](https://www.fastprep.io/problems/upstart-scale-ingredient-quantities) | Jul 12, 2026 | +| **IDFC** | [Find All People With Secret](https://www.fastprep.io/problems/idfc-find-all-people-with-secret) | Coding | [![Practice][p]](https://www.fastprep.io/problems/idfc-find-all-people-with-secret) | Jul 12, 2026 | +| **Optiver** | [Power Cell Bank](https://www.fastprep.io/problems/optiver-power-cell-bank) | Coding | [![Practice][p]](https://www.fastprep.io/problems/optiver-power-cell-bank) | Jul 12, 2026 | +| **DRW** | [Doctor Appointment Slot Assignment](https://www.fastprep.io/problems/drw-doctor-appointment-slot-assignment) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-doctor-appointment-slot-assignment) | Jul 12, 2026 | +| **DRW** | [Maximum Even-Sum Neighboring Pairs](https://www.fastprep.io/problems/drw-maximum-even-sum-neighboring-pairs) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-maximum-even-sum-neighboring-pairs) | Jul 12, 2026 | +| **DRW** | [Minimize Maximum Group Difference](https://www.fastprep.io/problems/drw-minimize-maximum-group-difference) | Coding | [![Practice][p]](https://www.fastprep.io/problems/drw-minimize-maximum-group-difference) | Jul 12, 2026 | +| **Goldman Sachs** | [Cheapest Flights Within K Stops](https://www.fastprep.io/problems/goldman-sachs-cheapest-flights-within-k-stops) | Coding | [![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-cheapest-flights-within-k-stops) | Jul 12, 2026 | +| **Goldman Sachs** | [Word Ladder](https://www.fastprep.io/problems/goldman-sachs-word-ladder) | Coding | [![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-word-ladder) | Jul 12, 2026 | +| **Rippling** | [Delivery Cost Tracker](https://www.fastprep.io/problems/rippling-delivery-cost-tracker) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-delivery-cost-tracker) | Jul 12, 2026 | +| **Rippling** | [Corporate Card Expense Rules](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine) | Jul 12, 2026 | +| **Rippling** | [Camel Cards](https://www.fastprep.io/problems/rippling-camel-cards) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-camel-cards) | Jul 12, 2026 | +| **Rippling** | [Article Vote Tracker](https://www.fastprep.io/problems/rippling-article-vote-tracker) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-article-vote-tracker) | Jul 12, 2026 | +| **Rippling** | [Employee Resource Access Management](https://www.fastprep.io/problems/rippling-employee-access-management) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-employee-access-management) | Jul 12, 2026 | +| **Rippling** | [Limit an Organization Tree's Height](https://www.fastprep.io/problems/rippling-org-tree-height-control) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-org-tree-height-control) | Jul 12, 2026 | +| **Rippling** | [Distributed System Recovery](https://www.fastprep.io/problems/rippling-distributed-system-recovery) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-distributed-system-recovery) | Jul 12, 2026 | +| **Rippling** | [Server Upgrade Planning](https://www.fastprep.io/problems/rippling-server-upgrade-planning) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-server-upgrade-planning) | Jul 12, 2026 | +| **Rippling** | [Shortest Substring](https://www.fastprep.io/problems/rippling-shortest-substring) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-shortest-substring) | Jul 12, 2026 | +| **Rippling** | [Song Play Analytics](https://www.fastprep.io/problems/rippling-song-play-analytics) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-song-play-analytics) | Jul 12, 2026 | +| **Rippling** | [Lexicographically Minimum Stack Encryption](https://www.fastprep.io/problems/rippling-lexicographically-minimum-encryption) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-lexicographically-minimum-encryption) | Jul 12, 2026 | +| **Rippling** | [Minimum Account Settlements](https://www.fastprep.io/problems/rippling-minimum-account-settlements) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-minimum-account-settlements) | Jul 12, 2026 | +| **Rippling** | [Matrix Region Sum](https://www.fastprep.io/problems/rippling-matrix-block-sum) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-matrix-block-sum) | Jul 12, 2026 | +| **Rippling** | [Maximum XOR Elimination Score](https://www.fastprep.io/problems/rippling-maximum-xor-elimination-score) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-maximum-xor-elimination-score) | Jul 12, 2026 | +| **Rippling** | [Prime Tree City Labelings](https://www.fastprep.io/problems/rippling-prime-tree-labelings) | Coding | [![Practice][p]](https://www.fastprep.io/problems/rippling-prime-tree-labelings) | Jul 12, 2026 | +| **Zomato / Eternal** | [Jump Game IV](https://www.fastprep.io/problems/zomato-jump-game-iv) | Coding | [![Practice][p]](https://www.fastprep.io/problems/zomato-jump-game-iv) | Jul 12, 2026 | +| **IndiaMART** | [Reverse a String](https://www.fastprep.io/problems/indiamart-reverse-string) | Coding | [![Practice][p]](https://www.fastprep.io/problems/indiamart-reverse-string) | Jul 12, 2026 | +| **Moody's** | [Longest Subarray with At Most Two Distinct Values](https://www.fastprep.io/problems/moodys-longest-subarray-at-most-two-distinct) | Coding | [![Practice][p]](https://www.fastprep.io/problems/moodys-longest-subarray-at-most-two-distinct) | Jul 12, 2026 | +| **MulticoreWare** | [Minimum Coin Change](https://www.fastprep.io/problems/multicoreware-minimum-coin-change) | Coding | [![Practice][p]](https://www.fastprep.io/problems/multicoreware-minimum-coin-change) | Jul 12, 2026 | +| **MulticoreWare** | [Second Distinct Largest Element](https://www.fastprep.io/problems/multicoreware-second-distinct-largest-element) | Coding | [![Practice][p]](https://www.fastprep.io/problems/multicoreware-second-distinct-largest-element) | Jul 12, 2026 | +| **Shipsy** | [Largest Rectangle in Histogram](https://www.fastprep.io/problems/shipsy-largest-rectangle-in-histogram) | Coding | [![Practice][p]](https://www.fastprep.io/problems/shipsy-largest-rectangle-in-histogram) | Jul 12, 2026 | +| **Stryker** | [Squares of a Sorted Array](https://www.fastprep.io/problems/stryker-squares-of-a-sorted-array) | Coding | [![Practice][p]](https://www.fastprep.io/problems/stryker-squares-of-a-sorted-array) | Jul 12, 2026 | +| **Hive** | [Validate a Directed Edge Addition](https://www.fastprep.io/problems/hive-validate-directed-edge-addition) | Coding | [![Practice][p]](https://www.fastprep.io/problems/hive-validate-directed-edge-addition) | Jul 12, 2026 | +| **Robinhood** | [Word Frequency in a Large Text](https://www.fastprep.io/problems/robinhood-word-frequency-in-large-text) | Coding | [![Practice][p]](https://www.fastprep.io/problems/robinhood-word-frequency-in-large-text) | Jul 12, 2026 | +| **Amazon** | [Repair recurring payments in the Wallet backend](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments) | AI coding | [![Practice][p]](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments) | Jul 12, 2026 | | **Target** | [Minimum Edit-Distance String for Each Query](https://www.fastprep.io/problems/target-minimum-edit-distance-string) | Coding | [![Practice][p]](https://www.fastprep.io/problems/target-minimum-edit-distance-string) | Jul 11, 2026 | | **Target** | [Count Lucky Numbers in a Range](https://www.fastprep.io/problems/target-lucky-numbers-floor-square-root) | Coding | [![Practice][p]](https://www.fastprep.io/problems/target-lucky-numbers-floor-square-root) | Jul 11, 2026 | | **Target** | [First-Available Seat Booking](https://www.fastprep.io/problems/target-first-available-seat-booking) | Coding | [![Practice][p]](https://www.fastprep.io/problems/target-first-available-seat-booking) | Jul 11, 2026 |