样例过了

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a1,a2,b1,b2,c1,c2,ab,bc,ac;
	cin>>a1>>a2>>b1>>b2>>c1>>c2;
	ab=sqrt((b1-a1)*(b1-a1)+(b2-a2)*(b2-a2));
	bc=sqrt((c1-b1)*(c1-b1)+(c2-b2)*(c2-b2));
	ac=sqrt((c1-a1)*(c1-a1)+(c2-a2)*(c2-a2));
	cout<<ab+bc+ac;
}