Interesting Sequences

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Rhea is presented with a weird sequence of positive integers by her teacher and has been asked to convert that into a interesting sequence by removing some elements. Rhea has found a way to make that sequence interesting, and according to her an sequence $X$ is an interesting sequence when: Every element $Y$ must occur exactly $Y$ times in $X$ Help Rhea to find the minimum number of elements to

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solution.cppC++17

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