资料来源: https://www.geeksforgeeks.org/initialize-a-vector-in-cpp-different-ways/
push_back初始化法
// CPP program to create an empty vector
// and push values one by one.
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Create an empty vector
vector<int> vect;
vect.push_back(10);
vect.push_back(20);
vect.push_back(30);
for (int x : vect)
cout << x << " ";
return 0;
}
初始值初始空间法
// CPP program to create an empty vector
// and push values one by one.
#include <bits/stdc++.h>
using namespace std;
int main()
{
int n = 3;
// Create a vector of size n with
// all values as 10.
vector<int> vect(n, 10);
for (int x : vect)
cout << x << " ";
return 0;
}
初始值法
// CPP program to initialize a vector like
// an array.
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect{ 10, 20, 30 };
for (int x : vect)
cout << x << " ";
return 0;
}
拷贝其它Vector
// CPP program to initialize a vector from
// an 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;
}
迭代器拷贝其它Vector
// CPP program to initialize a vector from
// another vector.
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect1{ 10, 20, 30 };
vector<int> vect2(vect1.begin(), vect1.end());
for (int x : vect2)
cout << x << " ";
return 0;
}