Prime power triples
This problem is simple.We can compare it with problem 86.
problem 86: solved by 5155.
problem 87: solved by 8745.
There is not too much to say about this problem. I compared the efficiency of set with unordered_set. I do not want to create a large vector. With set, it takes 0.62sec. With unordered_set, it takes 0.44sec.
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