放三个人之后长度是多少

运行下面这段程序：

#include <iostream>
#include <string>
#include <vector>
using namespace std;

struct Node {
    string name;
    Node* next = nullptr;
};

struct LinkList {
    Node* head = nullptr;

    void append(const string& name) {
        Node* nd = new Node{name};
        if (head == nullptr) {
            head = nd;
            return;
        }
        Node* cur = head;
        while (cur->next != nullptr) cur = cur->next;
        cur->next = nd;
    }

    int size() const {
        int n = 0;
        for (Node* cur = head; cur != nullptr; cur = cur->next) n++;
        return n;
    }

};

int main() {
    LinkList lk;
    for (const string& x : {"阿岚", "小满", "阿泰"}) lk.append(x);
    cout << lk.size() << endl;
}

（本题用 g++ -std=c++17 -O0 编译。）