arithmatic

class Solution {
public:
    bool canMakeArithmeticProgression(vector<int>& arr) {
       sort(arr.begin(),arr.end());

       int sample=arr[1]-arr[0];
        for(int i=2;i<arr.size();i++){
            if(arr[i]-arr[i-1]!=sample ) return false;
        }
        return true;
    }
};