Tournament Winner

• Time : O(n)
• Space : O(team)

#include <vector>
using namespace std;

string tournamentWinner(vector<vector<string>> competitions,
                        vector<int> results) {
    unordered_map<string, int> mp;
    string res = "";
    int ma = 0;
    for(int i = 0; i < results.size(); i++) {
        string winner = competitions[i][abs(results[i] - 1)];
        if(ma < (mp[winner] += 3)) {
            ma = mp[winner];
            res = winner;
        }
    }
    return res;
}