🎥 Slides:
https://www.canva.com/design/DAG11Q6gvg4/C6HUSJPN-lvOwlZ9WlVo-Q/view
📌 Sheet:
https://codeforces.com/group/dGAT8VJT3b/contests
👨🏻🏫Board:
https://drive.google.com/file/d/1tPRtiOhG5YYw5Nq5Q69AYakkY0xCbyR4/view?usp=sharing
🔗 Problems & Solutions:
- P1: https://codeforces.com/contest/520/problem/A
- S1: https://ideone.com/5YFz4e
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- P2: https://www.spoj.com/problems/CSUMQ/
- S2_1: https://ideone.com/yIgMlL
- S2_2: https://ideone.com/uOfVRW
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- P3: https://codeforces.com/contest/816/problem/B
- S3: https://ideone.com/PQ6Sqw
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⚙️ Extra:
- 2d prefix: https://ideone.com/Gdd2wi
⏱️ Timestamps:
0:00 – Intro
3:34 – Frequency array
10:41 – Problem 1
22:20 – Prefix
45:36 – Problem 2
47:56 – Suffix
59:42 – Partial sum trick
1:21:21 – Problem 3
1:36:00 – 2D Prefix sum
