Check out example codes for "accumulate in cpp". It will help you in understanding the concepts better.
Code Example 1
accumulate(first, last, sum); first, last : first and last elements of range whose elements are to be added sum : initial value of the sum
Code Example 2
accumulate(start, end, initial_sum);
Code Example 3
accumulate(first, last, sum, myfun); myfun : a function for performing any specific task. For example, we can find product of elements between first and last.
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