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D - Message from Aliens (ATCODER)

A. Odd Divisor | Logarithom

B. Red and Blue | DP | Codeforces

2D VECTOR && DFS

DP | FIZZA and MAGICIAN | CODECHEF

contest: Codeforces Round #142 (Div. 2), problem: (B) T-primes

Codeforces Round #435 (Div. 2), problem: (A) Mahmoud and Ehab and the MEX