I use this repository to save and present my solutions for the challenges on the EntwicklerHeld coding challenge platform.
Click on the challenge names for more details and to see the solution.
List Last updated: 2026-04-03
▮▯▯▯ = Easy
▮▮▯▯ = Medium
▮▮▮▯ = Hard
▮▮▮▮ = Hardcore
| Language | Total | ▮▯▯▯ | ▮▮▯▯ | ▮▮▮▯ | ▮▮▮▮ |
|---|---|---|---|---|---|
| JavaScript | 30 | 17 | 11 | 1 | 1 |
| Java | 25 | 9 | 15 | 1 | 0 |
| Python | 22 | 13 | 8 | 1 | 0 |
| PHP | 9 | 7 | 2 | 0 | 0 |
| Cpp | 4 | 2 | 2 | 0 | 0 |
| CSharp | 4 | 4 | 0 | 0 | 0 |
| Kotlin | 3 | 3 | 0 | 0 | 0 |
| PowerShell | 1 | 0 | 1 | 0 | 0 |
| Totals | 98 | 55 | 39 | 3 | 1 |
| Challenge Name | Difficulty | Overall Success Rate @EH | Overall Solved/Accepted @EH | Date Solved | Language |
|---|---|---|---|---|---|
| Anagram | ▮▯▯▯ | ████████░░ 84% | 1074 / 1285 | 2022-04-24 | JavaScript |
| FizzBuzz | ▮▯▯▯ | ███████░░░ 69% | 3392 / 4889 | 2022-04-24 | JavaScript |
| Pascal's Triangle | ▮▯▯▯ | ████████░░ 79% | 824 / 1037 | 2022-04-27 | JavaScript |
| Scary JavaScript | ▮▯▯▯ | ██████░░░░ 60% | 670 / 1119 | 2022-04-27 | JavaScript |
| Bricks and Water | ▮▯▯▯ | ████░░░░░░ 44% | 738 / 1688 | 2022-05-01 | JavaScript |
| TV Channel | ▮▯▯▯ | ████░░░░░░ 42% | 775 / 1832 | 2022-05-01 | JavaScript |
| Personal Data Safety | ▮▯▯▯ | ███████░░░ 65% | 558 / 860 | 2022-05-02 | PHP |
| Easter Challenge 2022 | ▮▯▯▯ | ██████░░░░ 63% | 145 / 231 | 2022-06-02 | PHP |
| Climbing Stairs | ▮▯▯▯ | ███████░░░ 69% | 601 / 871 | 2022-06-06 | JavaScript |
| Advent Bakery | ▮▮▯▯ | ████░░░░░░ 41% | 118 / 290 | 2022-06-16 | JavaScript |
| Matching Clients | ▮▮▯▯ | ████░░░░░░ 43% | 186 / 431 | 2022-06-19 | JavaScript |
| Happy Subnetting | ▮▮▮▯ | ███░░░░░░░ 26% | 60 / 229 | 2022-09-19 | JavaScript |
| Cinema Seat Reservation | ▮▮▮▮ | █░░░░░░░░░ 12% | 60 / 482 | 2022-10-08 | JavaScript |
| Mails to Santa | ▮▯▯▯ | ████░░░░░░ 44% | 138 / 317 | 2022-10-11 | PHP |
| Perfect Place | ▮▮▯▯ | ████░░░░░░ 37% | 95 / 260 | 2022-12-18 | JavaScript |
| Build a Clock | ▮▯▯▯ | ███████░░░ 68% | 365 / 534 | 2023-05-07 | JavaScript |
| Matching brackets | ▮▯▯▯ | ███████░░░ 74% | 401 / 543 | 2023-05-24 | JavaScript |
| Reverse SMS | ▮▮▯▯ | ██░░░░░░░░ 19% | 29 / 149 | 2023-06-23 | JavaScript |
| Flatten Arrays | ▮▯▯▯ | ████████░░ 80% | 872 / 1094 | 2023-06-26 | Python |
| Scary Python | ▮▯▯▯ | ██████░░░░ 63% | 1209 / 1905 | 2023-06-27 | Python |
| Say Numbers | ▮▮▯▯ | ██████░░░░ 58% | 290 / 501 | 2023-06-30 | Java |
| GDV Extraction | ▮▮▯▯ | ████░░░░░░ 38% | 71 / 186 | 2023-07-02 | JavaScript |
| Pizza for my Friends Challenge | ▮▮▯▯ | ███░░░░░░░ 31% | 249 / 802 | 2023-07-04 | JavaScript |
| Non Repeating Characters | ▮▯▯▯ | ███████░░░ 73% | 1733 / 2385 | 2023-07-05 | Python |
| IoT Office Sensors | ▮▯▯▯ | ██████░░░░ 56% | 175 / 312 | 2023-07-07 | Java |
| Change Calculator | ▮▮▯▯ | ████░░░░░░ 37% | 137 / 366 | 2023-07-11 | Java |
| State Machine | ▮▮▯▯ | ███████░░░ 69% | 677 / 979 | 2023-07-11 | Java |
| Storing vehicle data | ▮▮▯▯ | █████░░░░░ 46% | 234 / 504 | 2023-07-14 | Java |
| Maps and Polygons | ▮▮▮▯ | ███░░░░░░░ 30% | 62 / 204 | 2023-07-20 | Java |
| Binary Tree | ▮▮▯▯ | ███████░░░ 65% | 606 / 933 | 2023-07-28 | JavaScript |
| Rest API | ▮▮▯▯ | ████░░░░░░ 39% | 116 / 295 | 2023-08-04 | Java |
| Fizz Buzz without 'if' | ▮▯▯▯ | ████████░░ 81% | 939 / 1155 | 2023-08-07 | Python |
| Keyword Extractor | ▮▮▯▯ | █████░░░░░ 46% | 124 / 270 | 2023-08-16 | Python |
| Document Scan | ▮▮▯▯ | ███░░░░░░░ 30% | 74 / 243 | 2023-09-03 | Java |
| Bowling | ▮▯▯▯ | ██████░░░░ 55% | 133 / 243 | 2023-09-15 | JavaScript |
| Tracking Cyber Threats: The IP Location Task | ▮▮▯▯ | █████░░░░░ 49% | 103 / 210 | 2023-10-09 | PowerShell |
| Run Length Encoding | ▮▯▯▯ | █████████░ 88% | 393 / 445 | 2023-10-19 | JavaScript |
| Number conversion | ▮▯▯▯ | ████████░░ 75% | 403 / 535 | 2024-02-11 | Cpp |
| Binary Search | ▮▯▯▯ | ██████░░░░ 60% | 161 / 270 | 2024-02-29 | JavaScript |
| Grains | ▮▯▯▯ | █████████░ 87% | 570 / 656 | 2024-03-06 | Java |
| Robot Simulator | ▮▯▯▯ | ████████░░ 79% | 446 / 568 | 2024-03-09 | Cpp |
| Word Counter | ▮▮▯▯ | ████░░░░░░ 38% | 525 / 1378 | 2024-03-09 | Cpp |
| ISBN Verifier | ▮▯▯▯ | ████████░░ 76% | 180 / 237 | 2024-03-11 | Kotlin |
| Longest Substring | ▮▯▯▯ | █████░░░░░ 54% | 130 / 240 | 2024-03-12 | JavaScript |
| Client number validation | ▮▯▯▯ | ████████░░ 75% | 175 / 234 | 2024-03-13 | JavaScript |
| Hacking a Slot Machine | ▮▮▯▯ | ███░░░░░░░ 33% | 339 / 1016 | 2024-03-17 | Python |
| Airport Runway Direction | ▮▮▯▯ | ███░░░░░░░ 33% | 547 / 1661 | 2024-03-17 | Python |
| EntwicklerHeld Celebration | ▮▯▯▯ | ███████░░░ 70% | 1248 / 1778 | 2024-03-18 | Python |
| Filling Area | ▮▮▯▯ | █████░░░░░ 50% | 559 / 1121 | 2024-03-26 | Python |
| Fibonacci Numbers | ▮▯▯▯ | ████████░░ 78% | 907 / 1159 | 2024-03-26 | Python |
| Selfies in Copenhagen | ▮▮▯▯ | ████░░░░░░ 42% | 149 / 354 | 2024-03-27 | Python |
| Ancient Encryption | ▮▮▯▯ | ███████░░░ 74% | 412 / 557 | 2024-03-28 | Python |
| Prime Test | ▮▯▯▯ | ██████████ 95% | 658 / 695 | 2024-04-03 | Java |
| Circuit Breaker | ▮▮▯▯ | ████░░░░░░ 43% | 75 / 175 | 2024-04-05 | JavaScript |
| Filling Area (Hard Mode) | ▮▮▮▯ | ██████░░░░ 61% | 370 / 609 | 2024-04-07 | Python |
| Meter readings | ▮▯▯▯ | █████░░░░░ 45% | 309 / 688 | 2024-04-09 | PHP |
| Sportly Webapp - Getting Started | ▮▯▯▯ | ███░░░░░░░ 32% | 174 / 550 | 2024-04-13 | PHP |
| Easy Storage | ▮▯▯▯ | ██████░░░░ 64% | 1269 / 1994 | 2024-04-15 | Java |
| Candidates | ▮▮▯▯ | ████░░░░░░ 38% | 43 / 114 | 2024-04-15 | JavaScript |
| Santa's Cookie-Finder Magic | ▮▮▯▯ | ████░░░░░░ 38% | 65 / 170 | 2024-04-18 | Cpp |
| Message Distribution Network | ▮▮▯▯ | ███████░░░ 69% | 250 / 363 | 2024-04-19 | Java |
| Vendor's Box | ▮▮▯▯ | ██████░░░░ 63% | 336 / 530 | 2024-04-21 | Java |
| Windshield Wiper Check | ▮▮▯▯ | ██░░░░░░░░ 24% | 49 / 202 | 2024-04-24 | Python |
| Insurance Matching | ▮▮▯▯ | ████░░░░░░ 41% | 261 / 643 | 2024-04-27 | Java |
| Emoji Bot | ▮▯▯▯ | ████░░░░░░ 39% | 471 / 1208 | 2024-04-27 | Java |
| GPS Navigation | ▮▮▯▯ | ███░░░░░░░ 34% | 113 / 336 | 2024-04-28 | Python |
| Weigh the Slow Loris | ▮▯▯▯ | ██████░░░░ 62% | 1415 / 2274 | 2024-04-29 | Java |
| Page Wrapping | ▮▯▯▯ | ██░░░░░░░░ 21% | 32 / 151 | 2024-04-30 | JavaScript |
| Markdown Parser Refactoring | ▮▯▯▯ | ████░░░░░░ 38% | 95 / 252 | 2024-05-09 | PHP |
| Sportly Webapp - Add the Leaderboard | ▮▮▯▯ | ████░░░░░░ 41% | 94 / 227 | 2024-05-15 | PHP |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 76% | 74 / 97 | 2024-05-17 | Kotlin |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 82% | 141 / 171 | 2024-05-17 | Java |
| Armstrong Numbers | ▮▯▯▯ | █████████░ 87% | 209 / 240 | 2024-05-17 | Python |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 84% | 144 / 172 | 2024-05-17 | CSharp |
| Luhn Checksum | ▮▯▯▯ | ████████░░ 78% | 344 / 443 | 2024-05-17 | CSharp |
| Tickets for the City Tower | ▮▮▯▯ | ███░░░░░░░ 30% | 78 / 259 | 2024-05-19 | PHP |
| Allergies | ▮▯▯▯ | ██████░░░░ 62% | 197 / 317 | 2024-05-19 | CSharp |
| Christmas Tree of Hanoi | ▮▯▯▯ | ██████░░░░ 63% | 187 / 298 | 2024-05-22 | JavaScript |
| New Spaceship validation when entering the motherships | ▮▮▯▯ | ███░░░░░░░ 33% | 347 / 1055 | 2024-05-22 | Java |
| Handle the shopping cart | ▮▮▯▯ | ███░░░░░░░ 33% | 130 / 395 | 2024-06-05 | Java |
| Doubly Linked List | ▮▯▯▯ | ███████░░░ 65% | 130 / 201 | 2024-06-06 | Java |
| CamelCase to snake_case | ▮▯▯▯ | ██████░░░░ 55% | 174 / 319 | 2024-06-06 | Kotlin |
| Resistor Color Trio | ▮▯▯▯ | ████████░░ 79% | 249 / 317 | 2024-06-07 | Python |
| Knapsack | ▮▮▯▯ | ███░░░░░░░ 25% | 33 / 132 | 2024-06-08 | Java |
| Life Insurance | ▮▮▯▯ | ██████░░░░ 58% | 576 / 989 | 2024-06-09 | Java |
| Make the world a better place | ▮▮▯▯ | ███░░░░░░░ 28% | 276 / 990 | 2024-06-12 | Java |
| ChatGPT WhatsApp Bot | ▮▯▯▯ | ████░░░░░░ 37% | 83 / 223 | 2024-06-13 | Python |
| Lottery Sim | ▮▮▯▯ | ████████░░ 76% | 71 / 93 | 2024-06-14 | JavaScript |
| Patricia-Trie | ▮▮▯▯ | █████░░░░░ 50% | 38 / 76 | 2024-06-15 | JavaScript |
| String Calculation | ▮▯▯▯ | █████░░░░░ 52% | 282 / 541 | 2024-06-25 | CSharp |
| Analyse the Plant | ▮▮▯▯ | ███░░░░░░░ 34% | 128 / 373 | 2024-07-05 | Java |
| A small dumb Chatbot | ▮▯▯▯ | █████░░░░░ 46% | 315 / 685 | 2024-07-09 | PHP |
| High Scores | ▮▯▯▯ | █████████░ 92% | 238 / 260 | 2024-12-08 | Python |
| Emojis | ▮▯▯▯ | █████████░ 85% | 60 / 71 | 2025-08-03 | JavaScript |
| Fair Share | ▮▯▯▯ | ███████░░░ 65% | 111 / 171 | 2025-08-03 | Python |
| Space Age | ▮▯▯▯ | ████████░░ 82% | 191 / 233 | 2025-08-03 | Python |
| Crypto Square | ▮▯▯▯ | ██████░░░░ 61% | 211 / 345 | 2025-08-04 | Python |
| Bulb Switcher | ▮▯▯▯ | ███████░░░ 73% | 67 / 92 | 2025-08-12 | Java |
| Challenge Name | Difficulty | Overall Success Rate @EH | Overall Solved/Accepted @EH | Date Solved | Language |
|---|---|---|---|---|---|
| Cinema Seat Reservation | ▮▮▮▮ | █░░░░░░░░░ 12% | 60 / 482 | 2022-10-08 | JavaScript |
| Filling Area (Hard Mode) | ▮▮▮▯ | ██████░░░░ 61% | 370 / 609 | 2024-04-07 | Python |
| Maps and Polygons | ▮▮▮▯ | ███░░░░░░░ 30% | 62 / 204 | 2023-07-20 | Java |
| Happy Subnetting | ▮▮▮▯ | ███░░░░░░░ 26% | 60 / 229 | 2022-09-19 | JavaScript |
| Analyse the Plant | ▮▮▯▯ | ███░░░░░░░ 34% | 128 / 373 | 2024-07-05 | Java |
| Patricia-Trie | ▮▮▯▯ | █████░░░░░ 50% | 38 / 76 | 2024-06-15 | JavaScript |
| Lottery Sim | ▮▮▯▯ | ████████░░ 76% | 71 / 93 | 2024-06-14 | JavaScript |
| Make the world a better place | ▮▮▯▯ | ███░░░░░░░ 28% | 276 / 990 | 2024-06-12 | Java |
| Life Insurance | ▮▮▯▯ | ██████░░░░ 58% | 576 / 989 | 2024-06-09 | Java |
| Knapsack | ▮▮▯▯ | ███░░░░░░░ 25% | 33 / 132 | 2024-06-08 | Java |
| Handle the shopping cart | ▮▮▯▯ | ███░░░░░░░ 33% | 130 / 395 | 2024-06-05 | Java |
| New Spaceship validation when entering the motherships | ▮▮▯▯ | ███░░░░░░░ 33% | 347 / 1055 | 2024-05-22 | Java |
| Tickets for the City Tower | ▮▮▯▯ | ███░░░░░░░ 30% | 78 / 259 | 2024-05-19 | PHP |
| Sportly Webapp - Add the Leaderboard | ▮▮▯▯ | ████░░░░░░ 41% | 94 / 227 | 2024-05-15 | PHP |
| GPS Navigation | ▮▮▯▯ | ███░░░░░░░ 34% | 113 / 336 | 2024-04-28 | Python |
| Insurance Matching | ▮▮▯▯ | ████░░░░░░ 41% | 261 / 643 | 2024-04-27 | Java |
| Windshield Wiper Check | ▮▮▯▯ | ██░░░░░░░░ 24% | 49 / 202 | 2024-04-24 | Python |
| Vendor's Box | ▮▮▯▯ | ██████░░░░ 63% | 336 / 530 | 2024-04-21 | Java |
| Message Distribution Network | ▮▮▯▯ | ███████░░░ 69% | 250 / 363 | 2024-04-19 | Java |
| Santa's Cookie-Finder Magic | ▮▮▯▯ | ████░░░░░░ 38% | 65 / 170 | 2024-04-18 | Cpp |
| Candidates | ▮▮▯▯ | ████░░░░░░ 38% | 43 / 114 | 2024-04-15 | JavaScript |
| Circuit Breaker | ▮▮▯▯ | ████░░░░░░ 43% | 75 / 175 | 2024-04-05 | JavaScript |
| Ancient Encryption | ▮▮▯▯ | ███████░░░ 74% | 412 / 557 | 2024-03-28 | Python |
| Selfies in Copenhagen | ▮▮▯▯ | ████░░░░░░ 42% | 149 / 354 | 2024-03-27 | Python |
| Filling Area | ▮▮▯▯ | █████░░░░░ 50% | 559 / 1121 | 2024-03-26 | Python |
| Hacking a Slot Machine | ▮▮▯▯ | ███░░░░░░░ 33% | 339 / 1016 | 2024-03-17 | Python |
| Airport Runway Direction | ▮▮▯▯ | ███░░░░░░░ 33% | 547 / 1661 | 2024-03-17 | Python |
| Word Counter | ▮▮▯▯ | ████░░░░░░ 38% | 525 / 1378 | 2024-03-09 | Cpp |
| Tracking Cyber Threats: The IP Location Task | ▮▮▯▯ | █████░░░░░ 49% | 103 / 210 | 2023-10-09 | PowerShell |
| Document Scan | ▮▮▯▯ | ███░░░░░░░ 30% | 74 / 243 | 2023-09-03 | Java |
| Keyword Extractor | ▮▮▯▯ | █████░░░░░ 46% | 124 / 270 | 2023-08-16 | Python |
| Rest API | ▮▮▯▯ | ████░░░░░░ 39% | 116 / 295 | 2023-08-04 | Java |
| Binary Tree | ▮▮▯▯ | ███████░░░ 65% | 606 / 933 | 2023-07-28 | JavaScript |
| Storing vehicle data | ▮▮▯▯ | █████░░░░░ 46% | 234 / 504 | 2023-07-14 | Java |
| Change Calculator | ▮▮▯▯ | ████░░░░░░ 37% | 137 / 366 | 2023-07-11 | Java |
| State Machine | ▮▮▯▯ | ███████░░░ 69% | 677 / 979 | 2023-07-11 | Java |
| Pizza for my Friends Challenge | ▮▮▯▯ | ███░░░░░░░ 31% | 249 / 802 | 2023-07-04 | JavaScript |
| GDV Extraction | ▮▮▯▯ | ████░░░░░░ 38% | 71 / 186 | 2023-07-02 | JavaScript |
| Say Numbers | ▮▮▯▯ | ██████░░░░ 58% | 290 / 501 | 2023-06-30 | Java |
| Reverse SMS | ▮▮▯▯ | ██░░░░░░░░ 19% | 29 / 149 | 2023-06-23 | JavaScript |
| Perfect Place | ▮▮▯▯ | ████░░░░░░ 37% | 95 / 260 | 2022-12-18 | JavaScript |
| Matching Clients | ▮▮▯▯ | ████░░░░░░ 43% | 186 / 431 | 2022-06-19 | JavaScript |
| Advent Bakery | ▮▮▯▯ | ████░░░░░░ 41% | 118 / 290 | 2022-06-16 | JavaScript |
| Bulb Switcher | ▮▯▯▯ | ███████░░░ 73% | 67 / 92 | 2025-08-12 | Java |
| Crypto Square | ▮▯▯▯ | ██████░░░░ 61% | 211 / 345 | 2025-08-04 | Python |
| Emojis | ▮▯▯▯ | █████████░ 85% | 60 / 71 | 2025-08-03 | JavaScript |
| Fair Share | ▮▯▯▯ | ███████░░░ 65% | 111 / 171 | 2025-08-03 | Python |
| Space Age | ▮▯▯▯ | ████████░░ 82% | 191 / 233 | 2025-08-03 | Python |
| High Scores | ▮▯▯▯ | █████████░ 92% | 238 / 260 | 2024-12-08 | Python |
| A small dumb Chatbot | ▮▯▯▯ | █████░░░░░ 46% | 315 / 685 | 2024-07-09 | PHP |
| String Calculation | ▮▯▯▯ | █████░░░░░ 52% | 282 / 541 | 2024-06-25 | CSharp |
| ChatGPT WhatsApp Bot | ▮▯▯▯ | ████░░░░░░ 37% | 83 / 223 | 2024-06-13 | Python |
| Resistor Color Trio | ▮▯▯▯ | ████████░░ 79% | 249 / 317 | 2024-06-07 | Python |
| Doubly Linked List | ▮▯▯▯ | ███████░░░ 65% | 130 / 201 | 2024-06-06 | Java |
| CamelCase to snake_case | ▮▯▯▯ | ██████░░░░ 55% | 174 / 319 | 2024-06-06 | Kotlin |
| Christmas Tree of Hanoi | ▮▯▯▯ | ██████░░░░ 63% | 187 / 298 | 2024-05-22 | JavaScript |
| Allergies | ▮▯▯▯ | ██████░░░░ 62% | 197 / 317 | 2024-05-19 | CSharp |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 76% | 74 / 97 | 2024-05-17 | Kotlin |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 82% | 141 / 171 | 2024-05-17 | Java |
| Armstrong Numbers | ▮▯▯▯ | █████████░ 87% | 209 / 240 | 2024-05-17 | Python |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 84% | 144 / 172 | 2024-05-17 | CSharp |
| Luhn Checksum | ▮▯▯▯ | ████████░░ 78% | 344 / 443 | 2024-05-17 | CSharp |
| Markdown Parser Refactoring | ▮▯▯▯ | ████░░░░░░ 38% | 95 / 252 | 2024-05-09 | PHP |
| Page Wrapping | ▮▯▯▯ | ██░░░░░░░░ 21% | 32 / 151 | 2024-04-30 | JavaScript |
| Weigh the Slow Loris | ▮▯▯▯ | ██████░░░░ 62% | 1415 / 2274 | 2024-04-29 | Java |
| Emoji Bot | ▮▯▯▯ | ████░░░░░░ 39% | 471 / 1208 | 2024-04-27 | Java |
| Easy Storage | ▮▯▯▯ | ██████░░░░ 64% | 1269 / 1994 | 2024-04-15 | Java |
| Sportly Webapp - Getting Started | ▮▯▯▯ | ███░░░░░░░ 32% | 174 / 550 | 2024-04-13 | PHP |
| Meter readings | ▮▯▯▯ | █████░░░░░ 45% | 309 / 688 | 2024-04-09 | PHP |
| Prime Test | ▮▯▯▯ | ██████████ 95% | 658 / 695 | 2024-04-03 | Java |
| Fibonacci Numbers | ▮▯▯▯ | ████████░░ 78% | 907 / 1159 | 2024-03-26 | Python |
| EntwicklerHeld Celebration | ▮▯▯▯ | ███████░░░ 70% | 1248 / 1778 | 2024-03-18 | Python |
| Client number validation | ▮▯▯▯ | ████████░░ 75% | 175 / 234 | 2024-03-13 | JavaScript |
| Longest Substring | ▮▯▯▯ | █████░░░░░ 54% | 130 / 240 | 2024-03-12 | JavaScript |
| ISBN Verifier | ▮▯▯▯ | ████████░░ 76% | 180 / 237 | 2024-03-11 | Kotlin |
| Robot Simulator | ▮▯▯▯ | ████████░░ 79% | 446 / 568 | 2024-03-09 | Cpp |
| Grains | ▮▯▯▯ | █████████░ 87% | 570 / 656 | 2024-03-06 | Java |
| Binary Search | ▮▯▯▯ | ██████░░░░ 60% | 161 / 270 | 2024-02-29 | JavaScript |
| Number conversion | ▮▯▯▯ | ████████░░ 75% | 403 / 535 | 2024-02-11 | Cpp |
| Run Length Encoding | ▮▯▯▯ | █████████░ 88% | 393 / 445 | 2023-10-19 | JavaScript |
| Bowling | ▮▯▯▯ | ██████░░░░ 55% | 133 / 243 | 2023-09-15 | JavaScript |
| Fizz Buzz without 'if' | ▮▯▯▯ | ████████░░ 81% | 939 / 1155 | 2023-08-07 | Python |
| IoT Office Sensors | ▮▯▯▯ | ██████░░░░ 56% | 175 / 312 | 2023-07-07 | Java |
| Non Repeating Characters | ▮▯▯▯ | ███████░░░ 73% | 1733 / 2385 | 2023-07-05 | Python |
| Scary Python | ▮▯▯▯ | ██████░░░░ 63% | 1209 / 1905 | 2023-06-27 | Python |
| Flatten Arrays | ▮▯▯▯ | ████████░░ 80% | 872 / 1094 | 2023-06-26 | Python |
| Matching brackets | ▮▯▯▯ | ███████░░░ 74% | 401 / 543 | 2023-05-24 | JavaScript |
| Build a Clock | ▮▯▯▯ | ███████░░░ 68% | 365 / 534 | 2023-05-07 | JavaScript |
| Mails to Santa | ▮▯▯▯ | ████░░░░░░ 44% | 138 / 317 | 2022-10-11 | PHP |
| Climbing Stairs | ▮▯▯▯ | ███████░░░ 69% | 601 / 871 | 2022-06-06 | JavaScript |
| Easter Challenge 2022 | ▮▯▯▯ | ██████░░░░ 63% | 145 / 231 | 2022-06-02 | PHP |
| Personal Data Safety | ▮▯▯▯ | ███████░░░ 65% | 558 / 860 | 2022-05-02 | PHP |
| Bricks and Water | ▮▯▯▯ | ████░░░░░░ 44% | 738 / 1688 | 2022-05-01 | JavaScript |
| TV Channel | ▮▯▯▯ | ████░░░░░░ 42% | 775 / 1832 | 2022-05-01 | JavaScript |
| Pascal's Triangle | ▮▯▯▯ | ████████░░ 79% | 824 / 1037 | 2022-04-27 | JavaScript |
| Scary JavaScript | ▮▯▯▯ | ██████░░░░ 60% | 670 / 1119 | 2022-04-27 | JavaScript |
| Anagram | ▮▯▯▯ | ████████░░ 84% | 1074 / 1285 | 2022-04-24 | JavaScript |
| FizzBuzz | ▮▯▯▯ | ███████░░░ 69% | 3392 / 4889 | 2022-04-24 | JavaScript |
| Challenge Name | Difficulty | Overall Success Rate @EH | Overall Solved/Accepted @EH | Date Solved | Language |
|---|---|---|---|---|---|
| Cinema Seat Reservation | ▮▮▮▮ | █░░░░░░░░░ 12% | 60 / 482 | 2022-10-08 | JavaScript |
| Reverse SMS | ▮▮▯▯ | ██░░░░░░░░ 19% | 29 / 149 | 2023-06-23 | JavaScript |
| Page Wrapping | ▮▯▯▯ | ██░░░░░░░░ 21% | 32 / 151 | 2024-04-30 | JavaScript |
| Windshield Wiper Check | ▮▮▯▯ | ██░░░░░░░░ 24% | 49 / 202 | 2024-04-24 | Python |
| Knapsack | ▮▮▯▯ | ███░░░░░░░ 25% | 33 / 132 | 2024-06-08 | Java |
| Happy Subnetting | ▮▮▮▯ | ███░░░░░░░ 26% | 60 / 229 | 2022-09-19 | JavaScript |
| Make the world a better place | ▮▮▯▯ | ███░░░░░░░ 28% | 276 / 990 | 2024-06-12 | Java |
| Tickets for the City Tower | ▮▮▯▯ | ███░░░░░░░ 30% | 78 / 259 | 2024-05-19 | PHP |
| Document Scan | ▮▮▯▯ | ███░░░░░░░ 30% | 74 / 243 | 2023-09-03 | Java |
| Maps and Polygons | ▮▮▮▯ | ███░░░░░░░ 30% | 62 / 204 | 2023-07-20 | Java |
| Pizza for my Friends Challenge | ▮▮▯▯ | ███░░░░░░░ 31% | 249 / 802 | 2023-07-04 | JavaScript |
| Sportly Webapp - Getting Started | ▮▯▯▯ | ███░░░░░░░ 32% | 174 / 550 | 2024-04-13 | PHP |
| Handle the shopping cart | ▮▮▯▯ | ███░░░░░░░ 33% | 130 / 395 | 2024-06-05 | Java |
| New Spaceship validation when entering the motherships | ▮▮▯▯ | ███░░░░░░░ 33% | 347 / 1055 | 2024-05-22 | Java |
| Hacking a Slot Machine | ▮▮▯▯ | ███░░░░░░░ 33% | 339 / 1016 | 2024-03-17 | Python |
| Airport Runway Direction | ▮▮▯▯ | ███░░░░░░░ 33% | 547 / 1661 | 2024-03-17 | Python |
| Analyse the Plant | ▮▮▯▯ | ███░░░░░░░ 34% | 128 / 373 | 2024-07-05 | Java |
| GPS Navigation | ▮▮▯▯ | ███░░░░░░░ 34% | 113 / 336 | 2024-04-28 | Python |
| ChatGPT WhatsApp Bot | ▮▯▯▯ | ████░░░░░░ 37% | 83 / 223 | 2024-06-13 | Python |
| Change Calculator | ▮▮▯▯ | ████░░░░░░ 37% | 137 / 366 | 2023-07-11 | Java |
| Perfect Place | ▮▮▯▯ | ████░░░░░░ 37% | 95 / 260 | 2022-12-18 | JavaScript |
| Markdown Parser Refactoring | ▮▯▯▯ | ████░░░░░░ 38% | 95 / 252 | 2024-05-09 | PHP |
| Santa's Cookie-Finder Magic | ▮▮▯▯ | ████░░░░░░ 38% | 65 / 170 | 2024-04-18 | Cpp |
| Candidates | ▮▮▯▯ | ████░░░░░░ 38% | 43 / 114 | 2024-04-15 | JavaScript |
| Word Counter | ▮▮▯▯ | ████░░░░░░ 38% | 525 / 1378 | 2024-03-09 | Cpp |
| GDV Extraction | ▮▮▯▯ | ████░░░░░░ 38% | 71 / 186 | 2023-07-02 | JavaScript |
| Emoji Bot | ▮▯▯▯ | ████░░░░░░ 39% | 471 / 1208 | 2024-04-27 | Java |
| Rest API | ▮▮▯▯ | ████░░░░░░ 39% | 116 / 295 | 2023-08-04 | Java |
| Sportly Webapp - Add the Leaderboard | ▮▮▯▯ | ████░░░░░░ 41% | 94 / 227 | 2024-05-15 | PHP |
| Insurance Matching | ▮▮▯▯ | ████░░░░░░ 41% | 261 / 643 | 2024-04-27 | Java |
| Advent Bakery | ▮▮▯▯ | ████░░░░░░ 41% | 118 / 290 | 2022-06-16 | JavaScript |
| Selfies in Copenhagen | ▮▮▯▯ | ████░░░░░░ 42% | 149 / 354 | 2024-03-27 | Python |
| TV Channel | ▮▯▯▯ | ████░░░░░░ 42% | 775 / 1832 | 2022-05-01 | JavaScript |
| Circuit Breaker | ▮▮▯▯ | ████░░░░░░ 43% | 75 / 175 | 2024-04-05 | JavaScript |
| Matching Clients | ▮▮▯▯ | ████░░░░░░ 43% | 186 / 431 | 2022-06-19 | JavaScript |
| Mails to Santa | ▮▯▯▯ | ████░░░░░░ 44% | 138 / 317 | 2022-10-11 | PHP |
| Bricks and Water | ▮▯▯▯ | ████░░░░░░ 44% | 738 / 1688 | 2022-05-01 | JavaScript |
| Meter readings | ▮▯▯▯ | █████░░░░░ 45% | 309 / 688 | 2024-04-09 | PHP |
| A small dumb Chatbot | ▮▯▯▯ | █████░░░░░ 46% | 315 / 685 | 2024-07-09 | PHP |
| Keyword Extractor | ▮▮▯▯ | █████░░░░░ 46% | 124 / 270 | 2023-08-16 | Python |
| Storing vehicle data | ▮▮▯▯ | █████░░░░░ 46% | 234 / 504 | 2023-07-14 | Java |
| Tracking Cyber Threats: The IP Location Task | ▮▮▯▯ | █████░░░░░ 49% | 103 / 210 | 2023-10-09 | PowerShell |
| Patricia-Trie | ▮▮▯▯ | █████░░░░░ 50% | 38 / 76 | 2024-06-15 | JavaScript |
| Filling Area | ▮▮▯▯ | █████░░░░░ 50% | 559 / 1121 | 2024-03-26 | Python |
| String Calculation | ▮▯▯▯ | █████░░░░░ 52% | 282 / 541 | 2024-06-25 | CSharp |
| Longest Substring | ▮▯▯▯ | █████░░░░░ 54% | 130 / 240 | 2024-03-12 | JavaScript |
| CamelCase to snake_case | ▮▯▯▯ | ██████░░░░ 55% | 174 / 319 | 2024-06-06 | Kotlin |
| Bowling | ▮▯▯▯ | ██████░░░░ 55% | 133 / 243 | 2023-09-15 | JavaScript |
| IoT Office Sensors | ▮▯▯▯ | ██████░░░░ 56% | 175 / 312 | 2023-07-07 | Java |
| Life Insurance | ▮▮▯▯ | ██████░░░░ 58% | 576 / 989 | 2024-06-09 | Java |
| Say Numbers | ▮▮▯▯ | ██████░░░░ 58% | 290 / 501 | 2023-06-30 | Java |
| Binary Search | ▮▯▯▯ | ██████░░░░ 60% | 161 / 270 | 2024-02-29 | JavaScript |
| Scary JavaScript | ▮▯▯▯ | ██████░░░░ 60% | 670 / 1119 | 2022-04-27 | JavaScript |
| Crypto Square | ▮▯▯▯ | ██████░░░░ 61% | 211 / 345 | 2025-08-04 | Python |
| Filling Area (Hard Mode) | ▮▮▮▯ | ██████░░░░ 61% | 370 / 609 | 2024-04-07 | Python |
| Allergies | ▮▯▯▯ | ██████░░░░ 62% | 197 / 317 | 2024-05-19 | CSharp |
| Weigh the Slow Loris | ▮▯▯▯ | ██████░░░░ 62% | 1415 / 2274 | 2024-04-29 | Java |
| Christmas Tree of Hanoi | ▮▯▯▯ | ██████░░░░ 63% | 187 / 298 | 2024-05-22 | JavaScript |
| Vendor's Box | ▮▮▯▯ | ██████░░░░ 63% | 336 / 530 | 2024-04-21 | Java |
| Scary Python | ▮▯▯▯ | ██████░░░░ 63% | 1209 / 1905 | 2023-06-27 | Python |
| Easter Challenge 2022 | ▮▯▯▯ | ██████░░░░ 63% | 145 / 231 | 2022-06-02 | PHP |
| Easy Storage | ▮▯▯▯ | ██████░░░░ 64% | 1269 / 1994 | 2024-04-15 | Java |
| Fair Share | ▮▯▯▯ | ███████░░░ 65% | 111 / 171 | 2025-08-03 | Python |
| Doubly Linked List | ▮▯▯▯ | ███████░░░ 65% | 130 / 201 | 2024-06-06 | Java |
| Binary Tree | ▮▮▯▯ | ███████░░░ 65% | 606 / 933 | 2023-07-28 | JavaScript |
| Personal Data Safety | ▮▯▯▯ | ███████░░░ 65% | 558 / 860 | 2022-05-02 | PHP |
| Build a Clock | ▮▯▯▯ | ███████░░░ 68% | 365 / 534 | 2023-05-07 | JavaScript |
| Message Distribution Network | ▮▮▯▯ | ███████░░░ 69% | 250 / 363 | 2024-04-19 | Java |
| State Machine | ▮▮▯▯ | ███████░░░ 69% | 677 / 979 | 2023-07-11 | Java |
| Climbing Stairs | ▮▯▯▯ | ███████░░░ 69% | 601 / 871 | 2022-06-06 | JavaScript |
| FizzBuzz | ▮▯▯▯ | ███████░░░ 69% | 3392 / 4889 | 2022-04-24 | JavaScript |
| EntwicklerHeld Celebration | ▮▯▯▯ | ███████░░░ 70% | 1248 / 1778 | 2024-03-18 | Python |
| Bulb Switcher | ▮▯▯▯ | ███████░░░ 73% | 67 / 92 | 2025-08-12 | Java |
| Non Repeating Characters | ▮▯▯▯ | ███████░░░ 73% | 1733 / 2385 | 2023-07-05 | Python |
| Ancient Encryption | ▮▮▯▯ | ███████░░░ 74% | 412 / 557 | 2024-03-28 | Python |
| Matching brackets | ▮▯▯▯ | ███████░░░ 74% | 401 / 543 | 2023-05-24 | JavaScript |
| Client number validation | ▮▯▯▯ | ████████░░ 75% | 175 / 234 | 2024-03-13 | JavaScript |
| Number conversion | ▮▯▯▯ | ████████░░ 75% | 403 / 535 | 2024-02-11 | Cpp |
| Lottery Sim | ▮▮▯▯ | ████████░░ 76% | 71 / 93 | 2024-06-14 | JavaScript |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 76% | 74 / 97 | 2024-05-17 | Kotlin |
| ISBN Verifier | ▮▯▯▯ | ████████░░ 76% | 180 / 237 | 2024-03-11 | Kotlin |
| Luhn Checksum | ▮▯▯▯ | ████████░░ 78% | 344 / 443 | 2024-05-17 | CSharp |
| Fibonacci Numbers | ▮▯▯▯ | ████████░░ 78% | 907 / 1159 | 2024-03-26 | Python |
| Resistor Color Trio | ▮▯▯▯ | ████████░░ 79% | 249 / 317 | 2024-06-07 | Python |
| Robot Simulator | ▮▯▯▯ | ████████░░ 79% | 446 / 568 | 2024-03-09 | Cpp |
| Pascal's Triangle | ▮▯▯▯ | ████████░░ 79% | 824 / 1037 | 2022-04-27 | JavaScript |
| Flatten Arrays | ▮▯▯▯ | ████████░░ 80% | 872 / 1094 | 2023-06-26 | Python |
| Fizz Buzz without 'if' | ▮▯▯▯ | ████████░░ 81% | 939 / 1155 | 2023-08-07 | Python |
| Space Age | ▮▯▯▯ | ████████░░ 82% | 191 / 233 | 2025-08-03 | Python |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 82% | 141 / 171 | 2024-05-17 | Java |
| Armstrong Numbers | ▮▯▯▯ | ████████░░ 84% | 144 / 172 | 2024-05-17 | CSharp |
| Anagram | ▮▯▯▯ | ████████░░ 84% | 1074 / 1285 | 2022-04-24 | JavaScript |
| Emojis | ▮▯▯▯ | █████████░ 85% | 60 / 71 | 2025-08-03 | JavaScript |
| Armstrong Numbers | ▮▯▯▯ | █████████░ 87% | 209 / 240 | 2024-05-17 | Python |
| Grains | ▮▯▯▯ | █████████░ 87% | 570 / 656 | 2024-03-06 | Java |
| Run Length Encoding | ▮▯▯▯ | █████████░ 88% | 393 / 445 | 2023-10-19 | JavaScript |
| High Scores | ▮▯▯▯ | █████████░ 92% | 238 / 260 | 2024-12-08 | Python |
| Prime Test | ▮▯▯▯ | ██████████ 95% | 658 / 695 | 2024-04-03 | Java |