Read a Soroban Abacus
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Rotate a Matrix by 90 degrees
Matrix with different incremental runs
How many jokers?
expand intervals vol.3
Pancake sorting - minimum flips.
Packing oranges - one layer
Polite numbers. N-th polite number.
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