Educational dice game c++

/*
This is code for a two player dice game. It simulates rolling 5 dice, appending the result to a vector, then repeating that for ten rounds.
At the end, we iterate through and compare rounds to see which player has won the round.
/**/
#include <iostream>
#include <vector>
#include <string>

using namespace std;

int main()
{
    vector<int> playerOne;
    vector<int> playerTwo;

    cout << "Welcome to the dice game!\n" << endl;

    string playerOneName;
    cout << "Enter player 1's name: ";
    getline(cin, playerOneName);

    string playerTwoName;
    cout << "Enter player 2's name: ";
    getline(cin, playerTwoName);

    cout << "Welcome " << playerOneName << " and " << playerTwoName << endl;

    int roundCounter = 0;

    while (roundCounter < 11)
    {
        int playerOneRoll = rand() % 30 + 1;  // Generates a random number between 1-30
        int playerTwoRoll = rand() % 30 + 1;

        playerOne.push_back(playerOneRoll);  // Pushes players rolls to vector
        playerTwo.push_back(playerTwoRoll);

        ++roundCounter;  // Add one to round counter

    }

    for (int i = 0; i < playerOne.size(); ++i)  // Iterates through playerOne's vector and rolls for each round
    {
        for (int a = 0; a < playerTwo.size(); ++a)  // Iterates through playerTwo's vector and rolls for each round
        {
            if (i = a) // compares rolls by index within the vectors
            {
                if (playerOne[i] > playerTwo[a])  // Player 1 victory condition
                {
                    cout << "Round: " << i << " Player 1 Wins! with " << playerOne[i] << " Over " << playerTwo[a] << endl;

                }
                else if (playerTwo[a] > playerOne[i])  // Player 2 victory condition
                {
                    cout << "Round: " << a << " Player 2 Wins! with " << playerTwo[a] << " Over " << playerOne[i] << endl;

                }
                else  // Tie condition
                {
                    cout << "Round: " << i << " Was a tie!" << endl;

                }
            }
        }
    }



}