Posts

All the articles I've posted.

• LeetCode 567 Permutation in String

  7 Jun, 2026

  Solutions for LeetCode 567, medium, tags: hash table, two pointers, string, sliding window.

• LeetCode 1249 Minimum Remove to Make Valid Parentheses

  6 Jun, 2026

  Solutions for LeetCode 1249, medium, tags: string, stack.

• System Design - How Zero-Copy I/O Works

  6 Jun, 2026

  How zero-copy I/O works in Linux: the cost of traditional read/write, how sendfile() and splice() eliminate copies, how mmap fits in, and why Kafka and nginx are fast — with ASCII diagrams and kernel source code references.

• LeetCode 438 Find All Anagrams in a String

  6 Jun, 2026

  Solutions for LeetCode 438, medium, tags: hash table, string, sliding window.

• LeetCode 153 Find Minimum in Rotated Sorted Array

  5 Jun, 2026

  Solutions for LeetCode 153, medium, tags: array, binary search.

• LeetCode 787 Cheapest Flights Within K Stops

  5 Jun, 2026

  Solutions for LeetCode 787, medium, tags: dynamic programming, BFS, graph, heap, shortest path.