How to increase value of a k consecutive elements in an vector in c++?

Suppose we have an vector in c++ of size 8 with elements {0, 1, 1, 0, 0, 0, 1, 1} and i want to increase the size of a specific portion of vector by one, for example, lets say the portion of vector which needs to be increase by 1 is 0 to 5, then our final result is {1, 2, 2, 1, 1, 0, 0, 1, 1}.

Is it possible to do this in constant time using and standard method of vectors (like we a memset in c), without running any loop?