Sheldon and Pairs

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Sheldon is fond of finding common elements. One day, his teacher gives him an S grade challenge to find two elements $x$ and $y$ such that either $x$ or $y$ or both are present in all the pairs. Since the number of elements is very large to be manually computed, Sheldon asks for your help. Help Sheldon to get an S grade. ###Input: - First line contains two space-separated integers $N$ and $M

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solution.cppC++17

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