[Solved] Search variable/item/attribute using STL in c++?

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Something along the lines of

std::vector<std::pair<int, int>> 
  find_nonmatching_values(const std::unordered_multimap<int, int> & thing,
                          int key, int value) {
    std::vector<std::pair<int, int>> ret;
    auto range = thing.equal_range(key);
    std::copy_if(range.first, range.second, std::back_inserter(ret),
                 [value](const std::pair<const int, int> &p) 
                 { return p.second != value; });
    return ret;
}

Demo. Templatizing this code is left as an exercise for the reader.

solved Search variable/item/attribute using STL in c++?