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template<typename InputIterator>
inline typename InputIterator::value_type sum(InputIterator first, InputIterator last)
typename InputIterator::value_type init{};
return std::accumulate(first, last, init);
template<typename Container>
inline typename Container::value_type sum(const Container& cont)
typename Container::value_type init{};
return std::accumulate(std::begin(cont), std::end(cont), init);
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