Count Items Matching a Rule LeetCode solution in C++

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class Solution {
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 public:
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  int countMatches(vector<vector<string>> &items, string ruleKey, string ruleValue) {
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    int i;
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    if (ruleKey == "type") i = 0;
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    if (ruleKey == "color") i = 1;
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    if (ruleKey == "name") i = 2;
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    int ans = 0;
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    for (int j = 0; j < items.size(); j++) {
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      if (items[j][i] == ruleValue) ans++;
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    }
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    return ans;
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  }
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};