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#include<iostream> #include<vector> using namespace std; int main() { vector<int> v ={56,78,34,45}; cout<<"initial vector:"<<"\n"; for(int i:v) cout<<i<<"\n"; v.push_back(100); v.push_back(200); cout<<"after adding two element,contents of vector are:\n"; for(int i:v) cout<<i<<"\n"; cout<<"element at index 1:"<<v.at(1)<<"\n"; cout<<"element at index 3:"<<v.at(3)<<"\n"; v.at(4)=700; cout<<"after updating,the contents of vector:\n"; for(int i:v) cout<<i<<"\n"; v.pop_back(); v.pop_back(); cout<<"after deleting an element,contens of vector are:\n"; for(int i:v) cout<<i<<"\n"; return 0; }