Mode of Frequencies

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Chef opted for Bio-Statistics as an Open-Elective course in his university, but soon got bored, and decided to text his friends during lectures. The instructor caught Chef, and decided to punish him, by giving him a special assignment. There are $N$ numbers in a list $A = A_1, A_2, \ldots, A_N$. Chef needs to find the [mode](https://en.wikipedia.org/wiki/Mode_(statistics)) of the frequencies of

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solution.cppC++17

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