Distribute T-Shirts in a Marathon

#include <iostream>
#include <queue>
#include <stack>
#include <string>

using namespace std;

int main(){
    int n;
    stack<int> tshirts;
    queue<string> participants;
    cin >> n;
    int o;
    string ns;
    int k, t;
    while(n--){
        cin >> o;
        switch(o){
            case 1:
                cin >> k;
                for(int i = 0; i < k; i++){
                    cin >> ns;
                    participants.push(ns);
                }
                break;
            case 2:
                cin >> k;
                for(int i = 0; i < k; i++){
                    cin >> t;
                    tshirts.push(t);
                }
                break;
            case 3:
                cin >> k;
                for(int i = 0; i < k; i++){
                    cout << participants.front() << " " << tshirts.top() << endl;
                    participants.pop();
                    tshirts.pop();
                }
                break;
        }
    }
    return 0;
}