#include <iostream>
#include <algorithm>

struct Person {
    std::string name;
    int age;

    bool operator<(const Person &other) const {
        // 自定义的比较规则，按照年龄进行排序
        return age < other.age;
    }
};

bool compareByName(const Person &p1, const Person &p2) {
    // 自定义的比较函数，按照姓名进行排序
    return p1.name < p2.name;
}

int main() {
    Person people[] = {
        {"Alice", 20},
        {"Bob", 25},
        {"Charlie", 30},
        {"David", 35}};

    // 使用自定义的比较函数按照姓名排序结构体数组
    std::sort(people, people + 4, compareByName);

    // 使用lower_bound查找姓名为"Charlie"的人的位置
    Person target = {"Charlie", 0};
    auto it = std::lower_bound(people, people + 4, target, compareByName);

    if (it != people + 4 && it->name == target.name) {
        std::cout << "Found Charlie at index " << (it - people) << std::endl;
    } else {
        std::cout << "Charlie not found" << std::endl;
    }

    return 0;
}