Find the number of points (x,y) in square lattice with x^2 + y^2 =< n. This is related to Jame's Problem 1387. Here you have to find the number of points within a circle.
Test for balanced parentheses
Remove the small words from a list of words.
So many choices
peta to nano (x-ray)
Celsius to Kelvin
Basic arrays operations.
Periodic Table 101.
Change the sign
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