C++中的list容器如何插入和刪除第i個元素

//list插入和刪除函數主要用到三個函數；
//advance(it, tem1); 將迭代器移動到指定位置
//Data.insert(it, tem2); 插入數據
//Data.erase(it); 刪除數據

 1 #include <iostream>
#include<list>
using namespace std;


int main()
{
    list<int>Data;
    int n, q;
    int temint;
    int tem1, tem2;
    Data.clear();
    list<int>::iterator it;
    cin >> n >> q;
    for (int i = 0; i < n; i++) {
        cin >> temint;
        Data.push_back(temint);
    }
    for (int i = 0; i < q; i++) {
        it = Data.begin();
        cin >> temint >> tem1;
        if (temint == 1) {      //add
            if (tem1 >= Data.size()) {
                it = Data.end();
            }
            else {
                advance(it, tem1);
            }
            cin >> tem2;
            Data.insert(it, tem2);
        }
        else {
            if (tem1 > Data.size()) {
                continue;
            }
            advance(it, tem1 - 1);
            Data.erase(it);
        }
    }
    for (it = Data.begin(); it != Data.end(); it++) {
        if (it == Data.begin()) {
            cout << *it;
        }
        else {
            cout << " " << *it;
        }

    }
    return 0;
}