Can Make Arithmetic Progression From Sequence.cpp

class Solution {
public:
    bool canMakeArithmeticProgression(vector<int>& arr) {
      int n=arr.size();
      if (n == 1) return true; 
      sort(arr.begin(), arr.end()); 
      int d = arr[1] - arr[0]; 
      for (int i=2; i<n; i++) 
        if (arr[i] - arr[i-1] != d) 
          return false; 
      return true; 
    } 
};