题目链接：https://leetcode-cn.com/problems/can-make-arithmetic-progression-from-sequence/
题目如下：

class Solution {
public:
    bool canMakeArithmeticProgression(vector<int>& arr) {
        if(arr.size()<=2) return true;
        int temp=0;
        
        for(int i=0;i<arr.size()-1;i++){
            for(int j=i+1;j<arr.size();j++){
                if(arr[i]>arr[j]){
                    temp=arr[i];
                    arr[i]=arr[j];
                    arr[j]=temp;
                }
            }
        }

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

        return true;
    }
};