# Info & Summary

• Date: 2025-06-07
• Completion Status: A ✅ / B ✅ / C ❌ / D ✅ / E ✅ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	Math	Prefix Sum	🧠
D	String	Constructive	🧠
E	Tree DP	DFS / Tree DP	🧠🛠️
F	DSU	DSU	🌀
G	Math	Fast Fourier Transform	🌀