Tip: This kind of problem that seems incredibly hard usually have a formula (someone already researched this). Find the formula, and solve the problem.
Find relatively common elements in matrix rows
How many trades represent all the profit?
Matrix multiplication across rows
Mastermind II: Solve in 8 or less
USC Fall 2012 ACM: Martian Pranks
Slitherlink III: Evolve
Unique: Faster 'rows' for large array of uint8
Criss-Cross Verification: NHL
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