Coding stack
Valid Parentheses + Min Stack
LC 20, 155. Dual-stack min. Speak the invariant: top of min stack is current min.
Week 1Sunday 18 OctoberMonotonic stack
Day 6: Stacks
0 of 4 tasks completed0%
Coding monotonic stack
Daily Temperatures
LC 739. Next-greater template. Store indices, not values.
Coding monotonic stack
Largest Rectangle in Histogram
LC 84. Sentinel zeros. Narrate why each bar pops when it does.
System design reliability
Health checks and failover
Liveness vs readiness, slow-start, and cascading failure from bad probes.