Lizard pairs

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N lizards are standing in a line, each of them is either facing left or right with equal probability. A pair of indices (i,j) (iafraid pair if lizard at index i is facing right, and lizard at index j is facing left. What is the expected number of afraid pairs? ### Input The first line of the input contains an integer T denoting the number of test cases. For each case there is a single line contai

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solution.cppC++17

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