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Number theory

Integer Division and Modulus

• A. Adding Digits

Greatest Common Divisor (GCD) and Least Common Multiple (LCM)

• C. Orac and LCM
• B. Big Vova

Kadane's algorithm

• D. Maximum Sum on Even Positions

Prefix sum

• C. Good Subarrays

Dynamic programming

• C1. Pokémon Army (easy version)