dev里面编译显示一直错

#include<bits/stdc++.h>
using namespace std;
int x1,y1,x2,x3,y2,y3;
int main(){
	cin>>x1>>y1>>x2>>y2>>x3>>y3;
	double sum=0;
	sum+=sqrt(pow((max(x1,x2)-min(x1,x2),2))+pow((max(y1,y2)-min(y1,y2),2)));
	sum+=sqrt(pow((max(x2,x3)-min(x2,x3),2))+pow((max(y2,y3)-min(y2,y3),2)));
	sum+=sqrt(pow((max(x1,x3)-min(x1,x3),2))+pow((max(y1,y3)-min(y1,y3),2)));
	cout<<fixed<<setprecision(3)<<(double)sum;
	return 0;
} 

有没有大佬帮忙解答一下[鞠躬]