vector<int>& nums)什么意思

A vector is a dynamic array in C++ that allows us to store and manipulate a collection of elements of the same data type. The vector<int> is a specific type of vector that stores integers (int). Here is an example of how we can declare and initialize a vector<int>:

#include <vector>
#include <iostream>

using namespace std;

int main() {
  // declare and initialize a vector of integers
  vector<int> myVector = {1, 2, 3, 4, 5};
  
  // print the vector elements
  for (int i = 0; i < myVector.size(); i++) {
    cout << myVector[i] << " ";
  }
  cout << endl;
  
  return 0;
}

Output:

1 2 3 4 5

In this example, we declare a vector of integers called `myVector` and initialize it with five integer values. We then use a for loop to iterate through the elements of the vector and print them to the console. The output shows the values 1, 2, 3, 4, and 5, separated by spaces.