namespace std {
    template <class InputIterator, class T>
        T accumulate(InputIterator first, InputIterator last, T init);
    template <class InputIterator, class T, class BinaryOperation>
        T accumulate(InputIterator first, InputIterator last, T init,
            BinaryOperation binary_op);
 
    template <class InputIterator1, class InputIterator2, class T>
        T inner_product(InputIterator1 first1, InputIterator1 last1,
            InputIterator2 first2, T init);
    template <class InputIterator1, class InputIterator2, class T,
            class BinaryOperation1, class BinaryOperation2>
        T inner_product(InputIterator1 first1, InputIterator1 last1,
            InputIterator2 first2, T init,
            BinaryOperation1 binary_op1,
            BinaryOperation2 binary_op2);
 
    template <class InputIterator, class OutputIterator>
        OutputIterator partial_sum(InputIterator first,
            InputIterator last,
            OutputIterator result);
    template <class InputIterator, class OutputIterator,
            class BinaryOperation>
        OutputIterator partial_sum(InputIterator first,
            InputIterator last,
            OutputIterator result,
            BinaryOperation binary_op);
    template <class InputIterator, class OutputIterator>
        OutputIterator adjacent_difference(InputIterator first,
            InputIterator last,
            OutputIterator result);
    template <class InputIterator, class OutputIterator,
            class BinaryOperation>
        OutputIterator adjacent_difference(InputIterator first,
            InputIterator last,
            OutputIterator result,
            BinaryOperation binary_op);
 
    template <class ForwardIterator, class T>
        void iota(ForwardIterator first, ForwardIterator last, T value);
}