Question

I am trying to write contents of an array into a vector starting from an offset.

std::copy(arr,&arr[100],std::back_inserter(vect[offset]);

here arr is the array of 100 integers. and vect is a vector containing integres. What is wrong with the above piece of code?

Answer 1

Use the insert() function, specifically the variant that takes an offset and range:

vect.insert(vect.begin() + offset, arr,&arr[100]);