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 }