Minimum Count of Interns

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After selection for internship, interns were assigned for different projects. To have their feedback we asked them to fill one poll regarding their projects and works. Some subset of interns (possibly none or all of them) filled survey and told you how many other interns are working in the same project as them. Those answers are placed in an array Arr. Find the minimum number of interns so that

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solution.cppC++17

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