dangeling pointer: Delete iterator in iteration #74
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https://en.cppreference.com/w/cpp/container/map/erase "References and iterators to the erased elements are invalidated. Other references and iterators are not affected. '
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https://en.cppreference.com/w/cpp/container/map/erase
"References and iterators to the erased elements are invalidated. Other references and iterators are not affected. '