c++ add contents of one vector to another code example

Example 1: how to append one vector to another c++

vector<int> a;
vector<int> b;
// Appending the integers of b to the end of a 
a.insert(a.end(), b.begin(), b.end());

Example 2: appending a vector in vector

a.insert(a.end(), b.begin(), b.end());