C++判断一个vector是另一个vector的子集

直接看代码

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

int main()
{
    std::vector<std::string> vecA = {"str1", "str2", "str3", "str4", "str5"};
    std::vector<std::string> vecB = {"str2", "str1", "str5"};
    std::vector<std::string> vecC = {"str0", "str1", "str2"};

    std::sort(vecA.begin(), vecA.end());
    std::sort(vecB.begin(), vecB.end());
    std::sort(vecC.begin(), vecC.end());
    // 必须排序，因为std::includes要求有序，不然会抛异常的

    if (std::includes(vecA.begin(), vecA.end(), vecB.begin(), vecB.end()))
    {
        std::cout << "vecB是vecA的子集" << std::endl;
    }
    else
    {
        std::cout << "vecB不是vecA的子集" << std::endl;
    }

    if (std::includes(vecA.begin(), vecA.end(), vecC.begin(), vecC.end()))
    {
        std::cout << "vecC是vecA的子集" << std::endl;
    }
    else
    {
        std::cout << "vecC不是vecA的子集" << std::endl;
    }

    return 0;
}