样例过了...然后全部WA

#include<bits/stdc++.h>
using namespace std;
int main(){
    double a,b,c,d,e,f;
    cin>>a>>b>>c>>d>>e>>f;
    int x,y,z;
    x=sqrt((c-a)*(c-a)+(d-b)*(d-b));
    y=sqrt((e-c)*(e-c)+(f-d)*(f-d));
    z=sqrt((e-a)*(e-a)+(f-b)*(f-b));
    cout<<fixed<<setprecision(2)<<x+y+z;
    return 0;
}