4/27打卡 stl初识vector

 1 #include <iostream>
 2 #include <vector>
 3 using namespace std;
 4 
 5 
 6 void test()
 7 {
 8     vector<vector<int>>v;
 9     vector<int> v1;
10     vector<int> v2;
11     vector<int> v3;
12     vector<int> v4;
13     for (int i = 0; i < 4; i++)
14     {
15         v1.push_back(i + 1);
16         v2.push_back(i + 2);
17         v3.push_back(i + 3);
18         v4.push_back(i + 4);
19     }
20     v.push_back(v1);
21     v.push_back(v2);
22     v.push_back(v3);
23     v.push_back(v4);
24     for (vector<vector<int>>::iterator it = v.begin(); it != v.end(); it++)
25     {
26         for (vector<int>::iterator vit = (*it).begin(); vit != (*it).end(); vit++)
27         {
28             cout << *vit << " ";
29         }
30         cout << endl;
31     }
32 }
33 
34 int main() {
35     test();
36     return 0;
37 }