题解 | #迭代器遍历容器#

#include <iostream>
#include <iterator>
#include <vector>
// write your code here......

using namespace std;

int main() {

    // write your code here......
    vector<int > vec;
    int a;
    while (cin >> a) {
        vec.push_back(a);
    }

    vector<int>::iterator iter = vec.begin();
    while (iter != vec.end()) {
        cout << *iter << " ";
        iter++;
    }

    cout << endl;
    while (iter != vec.begin()) {
        iter--;
        cout << *iter << " ";

    }

    return 0;
}