dsa2 min read
Meta — Accounts Merge (Union-Find on Emails)
Merge accounts sharing common email addresses using Union-Find. Group emails by owner, merge accounts with shared emails, sort each merged group.
Read →
All Posts
1276 articles
dsa2 min read
Google — Trapping Rain Water II (3D BFS + Min-Heap)
Calculate how much water can be trapped in a 3D height matrix. Uses a min-heap BFS starting from the boundary, always processing the lowest border cell to determine water trapped inside.
Read →
dsa2 min read
Amazon — Find Median of Two Sorted Arrays (Binary Search)
Find the median of two sorted arrays in O(log(min(m,n))) time using binary search on partition points. A classic hard problem testing deep binary search understanding.
Read →
dsa2 min read
Meta — Clone Graph (Deep Copy with DFS/BFS + HashMap)
Create a deep copy of an undirected graph using DFS with a HashMap to track visited/cloned nodes. Meta tests this to evaluate graph traversal and pointer manipulation.
Read →
dsa3 min read
Company Problems — Master Recap & Interview Cheatsheet
Complete recap of all 24 company-tagged problems with pattern classification, company attribution, and key insights. Use as a final review checklist before company-specific interviews.
Read →
Page 242 of 256