Tip: This kind of problem that seems incredibly hard usually have a formula (someone already researched this). Find the formula, and solve the problem.
Extract leading non-zero digit
Twins in a Window
Solve the set of simultaneous linear equations
Is this triangle right-angled?
GJam 2014 China Rd A: Read Phone Number
USC Spring 2013 ACM: Snow Cones
Knots Contest: Score (ContestSuite)
Adding and Subtracting UINT variables
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