very cool question: learn some new tricks, and get 10 points, why not?!
Hint to spare the pain : string(NaN)==
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Height of a right-angled triangle
Make roundn function
Write c^3 as sum of two squares a^2+b^2
Combine the first and last names
Histogram of histogram
Cody meets Xiangqi: foresee the unseen (Part 1)
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