2347. Best Poker Hand

You are given an integer array ranks and a character array suits. You have 5 cards where the ith card has a rank of ranks[i] and a suit of suits[i].

The following are the types of poker hands you can make from best to worst:

1. “Flush”: Five cards of the same suit.
2. “Three of a Kind”: Three cards of the same rank.
3. “Pair”: Two cards of the same rank.
4. “High Card”: Any single card.

Return a string representing the best type of poker hand you can make with the given cards.

Note that the return values are case-sensitive.

class Solution {
public:
    string bestHand(vector<int>& ranks, vector<char>& suits) {
        unordered_set<char> us(begin(suits), end(suits));
        if(us.size() == 1) return"Flush";
        unordered_map<int, int> freq;
        for(auto r : ranks) freq[r]++;
        int ma = 0;
        for(auto [_,c] : freq) ma = max(ma,c);
        if(ma >= 3) return "Three of a Kind";
        if(ma == 2) return "Pair";
        return "High Card";
    }
};