String

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Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "". ### Input - The first line of input will contain a single integer $T$, denoting the number of test cases. - Each test case consists of multiple lines of input. - The first line of each test case contains two space-separated integers $N$ and $M$ — the

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solution.cppC++17

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