Problem	Data Structure / Algo	🔥 Key Insight / Mark
Tree Diameter	BFS	⭐🛠️🔥
Subtree Size	DFS	⭐🛠️🔥

# 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	🌀

📌 Description

A bipartite graph is a type of graph where the set of vertices can be divided into two disjoint sets $U$ and $V$ such that:

# Info & Summary

• Date: 2025-03-29
• Completion Status: A ✅ / B ✅ / C ✅ / D ❌ / E ✅ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
C	Graph	DFS/BFS/DSU	⭐🛠️🔥
D	Pairwise Pattern Check with Indexed Constraints	Simulation	⭐
E	String/Graph	DSU	🧠🌀⭐
F	Algebraic Dynamic Programming	DP/Prefix Sum	🌀
G	Tree	Matroid	🧠🌀

# Info & Summary

• Date: 2025-02-22
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
E	Shortest Path	BFS	🧠🔥
F	Tree DP	Tree DP/DFS	🔥

# Info & Summary

• Date: 2025-02-08
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	Math	Math	⭐
E	Connected component	DSU/DFS/BFS	🔥🛠️
F	Constructive	Fenwick Tree	🔥🛠️🧠

# Info & Summary

• Date: 2025-01-04
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	Shortest Distance	BFS	⭐🔥
E	Constructive	Math	🌀
F	DP	DP	🌀
F	FPS	FPS	🌀

# Info & Summary

• Date: 2024-12-14
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	Subsequence	Prefix Sum	⭐🔥
E	Grid	BFS	🧠
F	Math	Math	🌀
G	Query square root decomposition	Mo’s Algorithm	🌀