Coding topo sort
Course Schedule I / II
LC 207, 210. Kahn vs DFS cycle. Return the order, not just true/false.
Week 3Friday 30 OctoberGraphs
Day 18: Topo sort and union-find
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Coding union find
Connected Components
LC 323. Union by rank + path compression. Count remaining roots.
Coding union find
Accounts Merge
LC 721. Email → parent. Then group names. Sort for the output contract.
System design reliability
Circuit breaker, retry, timeout
Budgets, jitter, and why retries without a breaker take the site down.