how to find indices of more than one max elements in C++ [duplicate]

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• how would I sort a list and get the top K elements? (STL) 6 answers

I have been using std::max_element(vec), but it returns only one index(ie smallest index)

Example:

vector<int> v = {1, 2, 3, 4, 5, 3, 3, 2, 5};

std::max_element(v) would reference v[4], but I want indices of all max elements. What would be the best way to do this?