c++中如何查找vector中的元素_C++在vector中查找指定元素的方法

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

int main() {
    std::vector<int> nums = {10, 20, 30, 40, 50};
    int target = 30;

    auto it = std::find(nums.begin(), nums.end(), target);

    if (it != nums.end()) {
        std::cout << "元素找到，位置索引为: " << std::distance(nums.begin(), it) << std::endl;
    } else {
        std::cout << "未找到该元素" << std::endl;
    }

    return 0;
}

#include <iostream>
#include <vector>
#include <algorithm>
struct Person {
    std::string name;
    int age;
};

int main() {
    std::vector<Person> people = {{"Alice", 20}, {"Bob", 25}, {"Charlie", 30}};
    
    auto it = std::find_if(people.begin(), people.end(), [](const Person& p) {
        return p.age == 25;
    });

    if (it != people.end()) {
        std::cout << "找到年龄为25的人: " << it->name << std::endl;
    }

    return 0;
}

template<typename T>
bool contains(const std::vector<T>& vec, const T& value) {
    return std::find(vec.begin(), vec.end(), value) != vec.end();
}