vector中pair的“>>”写法

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    vector< pair<int, int> > pvec;   //如果写成vector<pair<int, int>> pvec;编译器会误认为流运算
    pair<int,int> par;
    par.first = 9;
    par.second = 23;
    pvec.push_back(par);
    pair<int, int> par2 = *pvec.begin();
    cout << par2.second << endl;
    return 0;
}