1773. Count Items Matching a Rule

You are given an array items, where each items[i] = [typei, colori, namei] describes the type, color, and name of the ith item. You are also given a rule represented by two strings, ruleKey and ruleValue.

The ith item is said to match the rule if one of the following is true:

• ruleKey == “type” and ruleValue == typei.
• ruleKey == “color” and ruleValue == colori.
• ruleKey == “name” and ruleValue == namei.

Return the number of items that match the given rule.

class Solution {
public:
    int countMatches(vector<vector<string>>& items, string ruleKey, string ruleValue) {
        int pos = ruleKey == "type" ? 0 : ruleKey == "color" ? 1 : 2, res = 0;
        for(auto& item : items) {
            if(item[pos] == ruleValue)
                res++;
        }
        return res;
    }
};