Number of Arithmetic Triplets LeetCode solution in C++

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class Solution {
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 public:
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  int arithmeticTriplets(vector<int> &nums, int diff) {
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    int ans = 0;
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    for (int i = 0; i < nums.size(); i++) {
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      for (int j = i + 1; j < nums.size(); j++) {
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        for (int k = j + 1; k < nums.size(); k++) {
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          if ((nums[j] - nums[i]) == diff && (nums[k] - nums[j]) == diff) {
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            ans++;
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          }
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        }
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      }
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    }
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    return ans;
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  }
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};