二维vector遍历

#include<iostream>
#include<vector>

using namespace std;

int main()
{
vector<vector<int>> ves;
vector<int> a{ 1, 2, 3 };
vector<int> b{ 2, 4, 5, 6 };

ves.push_back(a);
ves.push_back(b);
for (vector<vector<int>>::iterator it = ves.begin(); it != ves.end(); ++it){
for (int i = 0; i < (*it).size(); ++i)
cout << (*it)[i] << " " ;
}
}