怎样通过代码把连续的元素分开

Question

A=（1 2 3 6 7 8 9）怎么通过代码分成A1=（1 2 3）和A2=（6 7 8 9）？

Answer 1

vector<int> A{1,2,3,4,5,6,7,8,9};
vector<int> A1{A.begin(),A.begin()+3};
vector<int> A2{A.end()-4,A.end()};