# Info & Summary

• Date: 2025-04-12
• Completion Status: A ✅ / B ✅ / C ✅ / D ❌ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	String/constructive	Case Discussion/Greedy	⭐
E	Graph connectivity	DSU	⭐🔥🛠️
F	Tree	BFS/Sliding Window	⭐🔥🛠️
G	Bipartite matching	Binary Search/Max flow	🌀

# Info & Summary

• Date: 2025-03-15
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
C	Distinct elements	Prefix Sum/Suffix Sum	⭐🔥
D	Quadratic formula	Math/Binary Search	⭐
E	Subtree Size	DFS/Tree DP	🔥🛠️
F	Distinct elements	DP/Lazy Segment Tree	🌀🧠🛠️🔥
G	Maximize Distance	Binary Search/Max Flow	🌀