фикс кода

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
 
int main() {
 
     long n;
     long maxa = 0, maxb = 0, maxc = 0, mina, minb, minc;
    cin >> n;
    vector<long> a(n); vector<long> b(n); vector<long> c(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i] >> b[i] >> c[i];
    }
    mina = min_element(a[0], a[n]);
    minb = min_element(b[0], b[n]);
    minc = min_element(c[0], c[n]);
    maxa = max_element(a[0], a[n]);
    maxb = max_element(b[0], b[n]);
    maxc = max_element(c[0], c[n]);
}

mina = *min_element(a.begin(), a.end());

#include <iostream>
#include <algorithm>
#include <vector>
 
//-------------------------------------------------------------------------------------------------
int main()
{
    long n;
    std::cin >> n;
 
    std::vector<long> a(n);
    std::vector<long> b(n);
    std::vector<long> c(n);
 
    for (size_t i = 0; i < n; i++) 
    {
        std::cin >> a[i] >> b[i] >> c[i];
    }
 
    auto mina = std::min_element(a.cbegin(), a.cend());
    auto minb = std::min_element(b.cbegin(), b.cend());
    auto minc = std::min_element(c.cbegin(), c.cend());
    auto maxa = std::max_element(a.cbegin(), a.cend());
    auto maxb = std::max_element(b.cbegin(), b.cend());
    auto maxc = std::max_element(c.cbegin(), c.cend());
 
    std::cout << *mina << *minb << *minc;
    return 0;
}
//-------------------------------------------------------------------------------------------------