Count Number of Teams LeetCode solution in C++

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class Solution {
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 public:
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  int numTeams(vector<int> &rating) {
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    int i, j, n = rating.size(), ans = 0;
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    vector<int> grt(n, 0), les(n, 0);
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    for (i = 0; i < n; i++) {
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      for (j = i + 1; j < n; j++) {
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        if (rating[j] > rating[i])
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          grt[i] += 1;
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        else
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          les[i] += 1;
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      }
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    }
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    for (i = 0; i < n; i++) {
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      for (j = i + 1; j < n; j++) {
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        if (rating[j] > rating[i])
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          ans += grt[j];
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        else
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          ans += les[j];
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      }
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    }
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    return ans;
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  }
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};