C++ -`算法`库和命名空间`std`

#include <iostream>
#include <vector>
#include <algorithm>

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

// 重载 < 运算符
bool operator<(const Person& lhs, const Person& rhs) {
    return lhs.age < rhs.age;
}

int main() {
    std::vector<Person> people = {{"Alice", 30}, {"Bob", 25}, {"Charlie", 35}};
    std::sort(people.begin(), people.end());

    for (const auto& person : people) {
        std::cout << person.name << " " << person.age << std::endl;
    }

    return 0;
}

#include <iostream>
#include <vector>
#include <algorithm>

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

// 自定义比较函数
bool compareByAge(const Person& a, const Person& b) {
    return a.age < b.age;
}

int main() {
    std::vector<Person> people = {{"Alice", 30}, {"Bob", 25}, {"Charlie", 35}};
    std::sort(people.begin(), people.end(), compareByAge);

    for (const auto& person : people) {
        std::cout << person.name << " " << person.age << std::endl;
    }

    return 0;
}