# Info & Summary

• Date: 2025-05-17
• Completion Status: A ✅ / B ✅ / C ❌ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
C	String	Brute Force	🌀
E	Digit DP	Digit DP	🌀
F	Tree	DFS & Fenwick Tree	🌀
G	DP	DP/Fenwick Tree	🌀

# 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: 2024-11-02
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:

Problem	Type(s)	Data Structure / Algo	🔥 Key Insight / Mark
D	DFS	DFS	⭐🔥
E	Math	Fenwick Tree	🧠🛠️🌀
F	Tree/Graph	DP/LCA	🌀
G	Math	Robinson–Schensted correspondence	🌀

# Info & Summary

• Date: 2022-07-23
• Completion Status: A ✅ / B ✅ / C ✅ / D ✅ / E ❌ / F ❌ / G ❌
• Problem Type:
  • D: DP
  • F: Fenwick Tree