stl头文件

#include<vector>
#include "algorithm"

    vector<int > v1;
    v1.push_back(1);
    v1.push_back(2);
    v1.push_back(3);
    v1.push_back(4);
    v1.push_back(5);
    v1.push_back(6);
    v1.push_back(7);                        
    v1.push_back(7);    
    v1.push_back(7);    
    v1.push_back(7);

    for (vector<int>::iterator it = v1.begin(); it != v1.end(); it++) {
        cout << *it << endl;
    }
    int num=count(v1.begin(), v1.end(), 7);
    cout << "统计数据是:" << num << endl;