giúp vs ạ!! (c++)

mik cảm ơn trước ạ

#include <iostream>
using namespace std;
int main() {
    const int ROCK=0; 
    const int PAPER=1; 
    const int SCISSORS=2; 
    for (int p1=ROCK;p1<=SCISSORS;++p1) {
        for (int p2=ROCK;p2<= SCISSORS;++p2) {
            cout << "Nguoi choi 1 chon ";
            switch (p1) {
                case ROCK:cout<<"Da"; 
                break;
                case PAPER:cout<<"Giay"; 
                break;
                case SCISSORS:cout<< "Keo"; 
                break;
            }
            cout<<" va Nguoi choi 2 chon ";
            switch (p2) {
                case ROCK:cout<<"Da"; 
                break;
                case PAPER:cout<<"Giay"; 
                break;
                case SCISSORS:cout<<"Keo"; 
                break;
            }
            if (p1==p2) {
                cout<<": Hoa!"<<endl;
            } else if ((p1==ROCK && p2==SCISSORS) || 
                       (p1==PAPER && p2==ROCK) || 
                       (p1==SCISSORS && p2==PAPER)) {
                cout<<": Nguoi choi 1 thang!"<<endl;
            } else {
                cout<<": Nguoi choi 2 thang!"<<endl;
            }
        }
    }
    return 0;
}