c++ quiz game

#include <algorithm>
#include <iostream>
#include <chrono>
#include <map>
#include <vector>
#include <fstream>

using namespace std;

template <typename T>
struct container {
    int size;
    T* tainer;
    container<T>() : size(0), tainer(new T[1]){}
    container<T>(int s) : tainer(new T[s]), size(s){}
    container<T>(const vector<T>& v) : size(v.size()), tainer(new T[size]){
        T* cc = tainer;
        for (auto i = v.begin(); i < v.end(); i++) {
            *cc = *i;
            cc++;
        }
    }
    container<T>(int s, T val) : size(s), tainer(new T[size]){
            auto cc = tainer;
            while (cc < tainer + size) { *cc = val; cc++; }
        }
    ~container<T>() { delete[] tainer; }

    void shuffle() {
        srand(time(0));
        int a = rand() % 100;
        while (a) {
            swap(this->tainer[rand() % (size - 1)], this->tainer[rand() % (size - 1)]);
            a--;
        }
    }
    T& get(int index) {
        return this->tainer[index];
    }
    void push_back(T val) {
        T* c = new T[this->size+1];
        auto cc = c;
        auto cc_t = this->tainer;
        while (cc_t < this->tainer + this->size) {
            *cc = *cc_t;
            cc++; cc_t++;
        }
        c[this->size] = val;
        //delete this->tainer; //<~~~~~~~~~~not sure why this delete was giving me issues something going out of scope most likely
        this->tainer = c;
        this->size++;
    }
    T& operator[](int index) { return this->get(index); }

};

struct question {
    string q, a;

    question() :q(""), a("") {}
    question(string qu, string ans) :q(qu), a(ans) {}

    string get_q() {
        return this->q;
    }
    string get_a() {
        return this->a;
    }
    void set_q(string que) {
        this->q = que;
    }
    void set_a(string ans) {
        this->a = ans;
    }
    void ask() { cout << this->q << "\n\n"; }
    void show_answer() { cout << "The Answer is = " << this->a << "\n\n"; }
    bool compare(string a) {  //this isn't the greatest but working ok for the moment

        if (this->a.find(a) != this->a.npos) {
            return true;
        }
        return false;
    }
    bool operator==(string a) {
        return this->compare(a);
    }
    bool get_answer() {
        string ans{};
        int c = 0;
        while (c < 3) {
            cout << "Please Enter Your answer............Tries Left : " << (c == 0 ? "X X X" : c==1 ? "X X" : "X") << " \n\n";
            cin >> ans;
            if (this->compare(ans)) {
                cout << "Correct!!!\n\n";
                break;
            }
            c++;
             if(c<3){
                cout << "Incorrect, Try again\n\n";
                this->ask();
            }

        }
        if (c < 3) { return true; }
        else { this->show_answer(); }
        return false;
    }
};

struct quiz {
    int size,correct;
    container<question> con;

    quiz() :size(0), con(),correct(0) {}
    quiz(int size) :size(size), con(size),correct(0) {}
    quiz(vector<question>& v) :size(v.size()), con(v),correct(0) {}

    void add_question(question q) {
        this->con.push_back(q);
        this->update_size();
    }
    void add_question(string q, string a) {
        this->con.push_back(question(q, a));
        this->update_size();
    }
    void add_question(ifstream& ifs) {
        char s[156]{};
        bool t = false;
        question q{};
        while (ifs.getline(s,156,'\n')) {
            if (!t) { q.set_q(string(s)); }
            else {
                q.set_a(string(s));
                this->con.push_back(q);
            }
            t = !t;
            this->update_size();
        }
    }
    question& get(int index) {
        return this->con[index];
    }
    question& operator[](int index) {
        return this->get(index);
    }
    void update_size() { this->size = this->con.size; }
    void ask(question& q) { q.ask(); }

    bool get_answer(question& q) { return q.get_answer(); }
    void shuffle() { this->con.shuffle(); }
    void welcome() { cout << "Welcome to the Quiz Game Try your luck at all " << this->size << " questions \n Do you have what it takes to beat the high score???\n\n"; }
    void exit_msg() {cout << "Nice job you got " << this->correct << " answers correct out of " << this->size<<" \n\n Try again Can you get a perfect score ? \n"; }
    void execute() {
        welcome();
        for (auto i = this->con.tainer; i < con.tainer+con.size; i++) {
            ask(*i);
            if (get_answer(*i)) { this->correct++; }
        }
        exit_msg();
    }

};

int main() {

    ifstream ifs;
    ifs.open("qs.txt");
    if (!ifs.is_open()) { cout << "file not open "; return 0; }

    quiz test{};
    test.add_question(ifs);
    //test.add_question("how many nuggets are in a 4 piece?", "4");
    //test.add_question("how many days in a month?", "28 30 31");
    //test.add_question("how many hours are there in a week?", "168");
    //test.add_question("how many days in a weeK?", "7");
    //test.add_question("how much wood would a wood chuck chuck if a wood chuck could chuck wood?", "73");
    test.shuffle();
    //test.con[0].ask();
    //test.con[1].ask();
    //test.con[2].ask();
    //test.con[3].ask();
    test.execute();

}