POWER OF THREE

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You are given $n$ integers $(a1,a2,...,an)$. Find the number of pairs of indexes $i,j$ ($i$ < $j$) that $ai+aj$ is a power of $3$ (i. e. some integer $x$ exists so that $ai+aj$ = $3^x$). ### Input The first line contains the single positive integer $n$ — the number of integers. The second line contains n positive integers $a1,a2,...,an$ ### Output Print the number of pairs of indexes $i,j$ ($i$

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solution.cppC++17

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