https://www.geeksforgeeks.org/initialize-a-vector-in-cpp-different-ways/
Following are different ways to create and initialize a vector in C++ STL
Initializing by one by one pushing values :
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect;
vect.push_back(10);
vect.push_back(20);
vect.push_back(30);
for (int x : vect)
cout << x << " ";
return 0;
}
Output:
10 20 30
Specifying size and initializing all values :
#include <bits/stdc++.h>
using namespace std;
int main()
{
int n = 3;
vector<int> vect(n, 10);
for (int x : vect)
cout << x << " ";
return 0;
}
Output:
10 10 10
Initializing like arrays :
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect{ 10, 20, 30 };
for (int x : vect)
cout << x << " ";
return 0;
}
Output:
10 20 30
Initializing from array :
#include <bits/stdc++.h>
using namespace std;
int main()
{
int arr[] = { 10, 20, 30 };
int n = sizeof(arr) / sizeof(arr[0]);
vector<int> vect(arr, arr + n);
for (int x : vect)
cout << x << " ";
return 0;
}
Output:
10 20 30
Initializing from another vector :
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect1{ 10, 20, 30 };
vector<int> vect2(vect1.begin(), vect.end());
for (int x : vect2)
cout << x << " ";
return 0;
}
Output:
10 20 30
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