# Info & Summary

• Date: 2025-05-10
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	Multi-source BFS	Multi-source BFS	⭐🔥
E	Combination	Combination	🧠🛠️🌀
F	Interval Tree	Lowest Common Ancestor	🌀
G	square-root decomposition	Mo’s algorithm / Segment Tree	🌀