1502-can-make-arithmetic-progression-from-sequence.cpp

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