Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Summing Digits within Text
The Goldbach Conjecture
Reverse the vector
Given a window, how many subsets of a vector sum positive
Is this triangle right-angled?
Derivative of polynomial
Altitude of locations on the earth
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