sum/multiply (1)
template <class InputIterator1, class InputIterator2, class T>
T inner_product (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, T init);
custom (2)
template <class InputIterator1, class InputIterator2, class T,
class BinaryOperation1, class BinaryOperation2>
T inner_product (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, T init,
Binar......
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