Can Make Arithmetic Progression From Sequence.cpp

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