Perfect Number

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A number is said to be perfectly defined number if it consists of 3 and 4 only. You will have to find the maximum number of a perfectly defined number not longer than N digits. As the answer could be very large, print the final answer modulo 1000000007(10^9+7). ###Input: - First line of input contains the value of $T$ (no. of test cases) and then $T$ no. of lines consist the value of $N$ on a n

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solution.cppC++17

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