想了很久，就是想不明白哪里出错了，关于find count函数的，基础代码

#include <iostream>
#include <vector>
#include <string_view>
#include <array>
#include <algorithm>
using namespace std;

struct Man
{
    std::string_view a;
    int grad;
};

struct arrayW
{
    vector<Man>arra;
};

bool strnum( const Man& str)
{
    return (str.a.find("jk") != std::string_view::npos);
}

int main()
{
    arrayW arrau;
    arrau.arra.resize(3);
    arrau.arra[0] = { " kjk",67 };
    arrau.arra[1] = { " dfd",671 };
    arrau.arra[2] = { " fdd",673 };

    for (auto tem : arrau.arra)
    {
        cout << " " << tem.a << " " << tem.grad << endl;
    }
    auto found = find_if(arrau.arra.begin(),arrau.arra.end(),strnum);
    auto countnum = count_if(arrau.arra.begin(),arrau.arra.end(),strnum);
    if (found == arrau.arra.end())
    {
        cout << "未识别";
    }
    else
    {
        cout << found->a << endl;
        cout << countnum << endl;
    }
}