// C++ program to illustrate the
// Modifiers in vector
#include <bits/stdc++.h>
#include <vector>
using namespace std;
int main()
{
// Assign vector
vector<int> v;
// fill the array with 10 five times
v.assign(5, 10);
cout << "The vector elements are: ";
for (int i = 0; i < v.size(); i++)
cout << v[i] << " ";
// inserts 15 to the last position
v.push_back(15);
int n = v.size();
cout << "\nThe last element is: " << v[n - 1];
// removes last element
v.pop_back();
// prints the vector
cout << "\nThe vector elements are: ";
for (int i = 0; i < v.size(); i++)
cout << v[i] << " ";
// inserts 5 at the beginning
v.insert(v.begin(), 5);
cout << "\nThe first element is: " << v[0];
// removes the first element
v.erase(v.begin());
cout << "\nThe first element is: " << v[0];
// inserts at the beginning
v.emplace(v.begin(), 5);
cout << "\nThe first element is: " << v[0];
// Inserts 20 at the end
v.emplace_back(20);
n = v.size();
cout << "\nThe last element is: " << v[n - 1];
// erases the vector
v.clear();
cout << "\nVector size after erase(): " << v.size();
// two vector to perform swap
vector<int> v1, v2;
v1.push_back(1);
v1.push_back(2);
v2.push_back(3);
v2.push_back(4);
cout << "\n\nVector 1: ";
for (int i = 0; i < v1.size(); i++)
cout << v1[i] << " ";
cout << "\nVector 2: ";
for (int i = 0; i < v2.size(); i++)
cout << v2[i] << " ";
// Swaps v1 and v2
v1.swap(v2);
cout << "\nAfter Swap \nVector 1: ";
for (int i = 0; i < v1.size(); i++)
cout << v1[i] << " ";
cout << "\nVector 2: ";
for (int i = 0; i < v2.size(); i++)
cout << v2[i] << " ";
}