Can Make Arithmetic Progression From Sequence LeetCode solution in C++

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class Solution {
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 public:
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  bool canMakeArithmeticProgression(vector<int> &arr) {
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    sort(arr.begin(), arr.end());
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    int diff = arr[1] - arr[0];
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    for (int i = 1; i < arr.size(); i++) {
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      if (diff != arr[i] - arr[i - 1]) {
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        return false;
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      }
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    }
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    return true;
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  }
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};