AP
Size: a a a
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std::multimap<T, U> mm;
std::set s(mm.begin(), mm.end());
for (auto const& key: s)
{
auto range = mm.equal_range(key);
std::cout << key << " : " << std::distance(range.first, range.second) << std::endl;
}
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ключ1: 3
ключ1: 3
ключ1: 3
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