#include <bits/stdc++.h>
using namespace std;
int main(){
vector<int> v1{10, 20, 30, 40, 50};
//removing elemenets
v1.pop_back(); //removes 50
v1.pop_back(); //removes 40
}
vector<int> v1;
v1.push_back(10); // adds 10
v1.pop_back(); // removes 10