Matrix Exponentiation Coding (Part 1/2)

It's time to code problems from Matrix Exponentiation training contest. This is part 1 with solutions to easy-medium problems ABCDEF.
contest link: https://codeforces.com/gym/102644
cf article and hints: https://codeforces.com/blog/entry/80195
matrix expo tutorial video:    • Matrix Exponentiation + Fibonacci in ...  
part 2 with GHI:    • Matrix Exponentiation Coding (Part 2/...  

0:00 Introduction
0:35 A. Random Mood
11:45 B. String Mood
16:11 C. Fibonacci
24:43 D. Count Paths
34:04 E. Knight Paths
50:29 F. Min Path

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