cpp中初始化vector的5種方式

Initializing like arrays :

vector<int> vect{ 10, 20, 30 };

Specifying size and initializing all values :

int n = 3;

// Create a vector of size n with
// all values as 10.
vector<int> vect(n, 10);

Initializing by one by one pushing values :

// Create an empty vector
    vector<int> vect; 

    vect.push_back(10);
    vect.push_back(20);
    vect.push_back(30);

Initializing from array :

int arr[] = { 10, 20, 30 };
int n = sizeof(arr) / sizeof(arr[0]);

vector<int> vect(arr, arr + n);

Initializing from another vector :

vector<int> vect1{ 10, 20, 30 };
vector<int> vect2(vect1.begin(), vect.end());

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References：
https://www.geeksforgeeks.org/initialize-a-vector-in-cpp-different-ways/