ื“ืœื’ ืœืชื•ื›ืŸ ื”ืจืืฉื™
ืจืื™ื•ื ื•ืช2026-02-20ยท2 ื“ืงื•ืช ืงืจื™ืื”

๐ŸŽฏ 20 ืฉืืœื•ืช ื ืคื•ืฆื•ืช ื‘ืจืื™ื•ืŸ ื”ื™ื™ื˜ืง 2026 โ€” ืขื ืชืฉื•ื‘ื•ืช

โœ“ ืžืชื›ื•ื ื ื™ื ืœืจืื™ื•ืŸ ื˜ื›ื ื™? 20 ื”ืฉืืœื•ืช ื”ื ืคื•ืฆื•ืช ื‘ื™ื•ืชืจ: ืงื•ื“, System Design, ืฉืืœื•ืช ื”ืชื ื”ื’ื•ืชื™ื•ืช + ืชืฉื•ื‘ื•ืช ืžื•ืžืœืฆื•ืช ืžืืงืกืคืจื˜ื™ื โœ“

20 ืฉืืœื•ืช ื ืคื•ืฆื•ืช ื‘ืจืื™ื•ืŸ ื˜ื›ื ื™

ืจืื™ื•ื ื•ืช ื˜ื›ื ื™ื™ื ื‘ื”ื™ื™ื˜ืง ื”ื™ืฉืจืืœื™ ื‘ื•ื“ืงื™ื ื™ื“ืข ื˜ื›ื ื™, ื—ืฉื™ื‘ื” ืืœื’ื•ืจื™ืชืžื™ืช ื•ื™ื›ื•ืœืช ืขื‘ื•ื“ื” ื‘ืฆื•ื•ืช. ื”ื ื” ื”ืฉืืœื•ืช ืฉืฆืคื•ื™ื•ืช ืœืขืœื•ืช โ€” ื•ืื™ืš ืœื”ืชื›ื•ื ืŸ ืืœื™ื”ืŸ.

ืฉืืœื•ืช ืงื•ื“ ื•ืืœื’ื•ืจื™ืชืžื™ืงื”

  1. ื”ืกื‘ื™ืจื• ืืช ื”ื”ื‘ื“ืœ ื‘ื™ืŸ Stack ืœ-Queue โ€” Stack ื”ื•ื LIFO, Queue ื”ื•ื FIFO. ืชื ื• ื“ื•ื’ืžื” ืžื”ืขื•ืœื ื”ืืžื™ืชื™.
  2. ื›ืชื‘ื• ืคื•ื ืงืฆื™ื” ืฉืžื•ืฆืืช ืืช ื”ืื™ื‘ืจ ื”ื—ืกืจ ื‘ืžืขืจืš โ€” ื—ืฉื‘ื• ืขืœ XOR ืื• ืกื›ื•ื ืืจื™ืชืžื˜ื™.
  3. ืžื”ื• Big O ื•ืœืžื” ื”ื•ื ื—ืฉื•ื‘? โ€” ื”ืกื‘ื™ืจื• ืกื™ื‘ื•ื›ื™ื•ืช ื–ืžืŸ ื•ืžืงื•ื ืขื ื“ื•ื’ืžืื•ืช.
  4. ื”ืคื›ื• ืžื—ืจื•ื–ืช ืœืœื ืฉื™ืžื•ืฉ ื‘ืคื•ื ืงืฆื™ื•ืช ืžื•ื‘ื ื•ืช โ€” ืฉืืœื” ืงืœืืกื™ืช ืฉื‘ื•ื“ืงืช ื—ืฉื™ื‘ื” ื‘ืกื™ืกื™ืช.
  5. ืžืฆืื• ืื ืฉื ื™ ืžื—ืจื•ื–ื•ืช ื”ืŸ Anagram โ€” ืกืคื™ืจืช ืชื•ื•ื™ื ืื• ืžื™ื•ืŸ.
  6. ืžื”ื• Hash Table ื•ืื™ืš ื”ื•ื ืขื•ื‘ื“? โ€” ื”ืกื‘ื™ืจื• ืขืœ hash function, collisions ื•-time complexity.
  7. ื›ืชื‘ื• ืืœื’ื•ืจื™ืชื ืœืžื™ื•ืŸ ืžืขืจืš โ€” ื”ื›ื™ืจื• ืœืคื—ื•ืช Merge Sort, Quick Sort ื•-Bubble Sort.

ืฉืืœื•ืช System Design

  1. ืชื›ื ื ื• ืžืขืจื›ืช URL Shortener โ€” ื—ืฉื‘ื• ืขืœ database, hashing, caching ื•-scaling.
  2. ืื™ืš ื”ื™ื™ืชื ื‘ื•ื ื™ื ืžืขืจื›ืช Chat? โ€” WebSockets, message queue, database design.
  3. ื”ืกื‘ื™ืจื• ืืช ื”ื”ื‘ื“ืœ ื‘ื™ืŸ SQL ืœ-NoSQL โ€” ืžืชื™ ืœื”ืฉืชืžืฉ ื‘ื›ืœ ืื—ื“ ืžื”ื.
  4. ืžื”ื• Load Balancer ื•ืœืžื” ืฆืจื™ืš ืื•ืชื•? โ€” ื”ืกื‘ื™ืจื• ืขืœ Round Robin, sticky sessions ื•-health checks.
  5. ืื™ืš ืขื•ื‘ื“ Caching? โ€” CDN, Redis, browser cache ื•ืืกื˜ืจื˜ื’ื™ื•ืช invalidation.
  6. ืชื›ื ื ื• API ืœ-feed ืฉืœ ืจืฉืช ื—ื‘ืจืชื™ืช โ€” pagination, sorting, real-time updates.

ืฉืืœื•ืช ื”ืชื ื”ื’ื•ืชื™ื•ืช (Behavioral)

  1. ืกืคืจื• ืขืœ ืคืจื•ื™ืงื˜ ืฉื ื›ืฉืœ ื•ืžื” ืœืžื“ืชื โ€” ื”ืจืื• ืื—ืจื™ื•ืช ื•ืœืžื™ื“ื”.
  2. ืื™ืš ืืชื ืžืชืžื•ื“ื“ื™ื ืขื ื—ื™ืœื•ืงื™ ื“ืขื•ืช ื‘ืฆื•ื•ืช? โ€” ืชืงืฉื•ืจืช, ื”ืงืฉื‘ื” ื•ืคืฉืจื”.
  3. ืชืืจื• ืžืฆื‘ ืฉื‘ื• ืขื‘ื“ืชื ืชื—ืช ืœื—ืฅ โ€” ื”ื“ื’ื™ืฉื• ื ื™ื”ื•ืœ ื–ืžืŸ ื•ืชืขื“ื•ืฃ.
  4. ืœืžื” ืืชื ืจื•ืฆื™ื ืœืขื‘ื•ื“ ืืฆืœื ื•? โ€” ืขืฉื• ืžื—ืงืจ ืขืœ ื”ื—ื‘ืจื” ืœืคื ื™ ื”ืจืื™ื•ืŸ.
  5. ืื™ืคื” ืืชื ืจื•ืื™ื ืืช ืขืฆืžื›ื ื‘ืขื•ื“ 5 ืฉื ื™ื? โ€” ื”ืจืื• ืฉืื™ืคื” ืœืฆืžื•ื— ื‘ืชื•ืš ื”ื—ื‘ืจื”.
  6. ืื™ืš ืืชื ื ืฉืืจื™ื ืžืขื•ื“ื›ื ื™ื ื˜ื›ื ื•ืœื•ื’ื™ืช? โ€” ื‘ืœื•ื’ื™ื, ืงื•ืจืกื™ื, ื›ื ืกื™ื, ืคืจื•ื™ืงื˜ื™ื ืฆื“ื“ื™ื™ื.
  7. ืชื ื• ื“ื•ื’ืžื” ืœืžืฉื”ื• ืฉืœืžื“ืชื ืœื‘ื“ โ€” ื”ืจืื• ื™ื›ื•ืœืช ืœืžื™ื“ื” ืขืฆืžืื™ืช.

ื˜ื™ืคื™ื ื›ืœืœื™ื™ื ืœืจืื™ื•ืŸ ื˜ื›ื ื™

  • ืชืจื’ืœื• ื‘-LeetCode โ€” ืคืชืจื• ืœืคื—ื•ืช 50 ื‘ืขื™ื•ืช ืœืคื ื™ ืจืื™ื•ืŸ
  • ื—ืฉื‘ื• ื‘ืงื•ืœ โ€” ื”ืžืจืื™ื™ืŸ ืจื•ืฆื” ืœืจืื•ืช ืืช ืชื”ืœื™ืš ื”ื—ืฉื™ื‘ื”, ืœื ืจืง ืืช ื”ืชืฉื•ื‘ื”
  • ืฉืืœื• ืฉืืœื•ืช ื”ื‘ื”ืจื” โ€” ืœืคื ื™ ืฉืžืชื—ื™ืœื™ื, ื•ื•ื“ืื• ืฉืืชื ืžื‘ื™ื ื™ื ืืช ื”ื‘ืขื™ื”
  • ื”ืชื—ื™ืœื• ืžืคืชืจื•ืŸ ืคืฉื•ื˜ โ€” ื•ืื– ืฉืคืจื•. Brute force ืงื•ื“ื, ืื•ืคื˜ื™ืžื™ื–ืฆื™ื” ืื—ืจ ื›ืš
  • ืชืจื’ืœื• ืขืœ ืœื•ื— ืœื‘ืŸ โ€” ื”ืจื‘ื” ืจืื™ื•ื ื•ืช ืขื“ื™ื™ืŸ ื›ื•ืœืœื™ื ื›ืชื™ื‘ืช ืงื•ื“ ื‘ื™ื“

ืกื™ื›ื•ื

ื”ื›ื ื” ืœืจืื™ื•ืŸ ื˜ื›ื ื™ ื“ื•ืจืฉืช ื–ืžืŸ, ืื‘ืœ ื”ืชื•ืฆืื•ืช ืฉื•ื•ืช ืืช ื”ื”ืฉืงืขื”. ืชืจื’ื•ืœ ืขืงื‘ื™ ื•ืžื•ื“ืขื•ืช ืœืกื•ื’ื™ ื”ืฉืืœื•ืช ื”ื ืคื•ืฆื™ื ื™ืขื–ืจื• ืœื›ื ืœื”ื’ื™ืข ืžื•ื›ื ื™ื.

ืงื™ืฉื•ืจื™ื ืฉื™ืžื•ืฉื™ื™ื

ืคื•ืกื˜ื™ื ืงืฉื•ืจื™ื

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ื˜ื™ืคื™ื ืœืจืื™ื•ืŸ ืขื‘ื•ื“ื” ืžื•ืฆืœื—

10 ื˜ื™ืคื™ื ืคืจืงื˜ื™ื™ื ืฉื™ืขื–ืจื• ืœื›ื ืœื”ืฆืœื™ื— ื‘ืจืื™ื•ืŸ ื”ืขื‘ื•ื“ื” ื”ื‘ื โ€“ ืžื”ื›ื ื” ืžื•ืงื“ืžืช ื•ืขื“ ืžืขืงื‘ ืœืื—ืจ ื”ืจืื™ื•ืŸ.

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ืื™ืš ืœืขื‘ื•ืจ ืจืื™ื•ืŸ ื˜ื›ื ื™ ื‘ื”ืฆืœื—ื”

ืžื“ืจื™ืš ืžืงื™ืฃ ืœื”ื›ื ื” ืœืจืื™ื•ื ื•ืช ื˜ื›ื ื™ื™ื โ€“ ืจืื™ื•ื ื™ ืงื•ื“, ืชื›ื ื•ืŸ ืžืขืจื›ื•ืช ื•ื˜ื™ืคื™ื ืžืขืฉื™ื™ื.

ืจืื™ื•ื ื•ืช2026-03-17

ื”ื›ื ื” ืœืจืื™ื•ืŸ ื˜ื›ื ื™ 2026 โ€” ืžื” ืฉื•ืืœื™ื ื•ืื™ืš ืœืขื ื•ืช

ืจืื™ื•ืŸ ื˜ื›ื ื™ ื‘ื”ื™ื™ื˜ืง? ื”ื ื” ื”ืฉืืœื•ืช ื”ื ืคื•ืฆื•ืช ื‘ื™ื•ืชืจ, ืื™ืš ืœื”ืชื›ื•ื ืŸ, ื•ืžื” ืžื’ื™ื™ืกื™ื ื‘ืืžืช ืžื—ืคืฉื™ื.