DEVc++ 上编译没问题，洛谷报错

#include<bits/stdc++.h>
#include<windows.h>
using namespace std;
int main(){
	int n; 
	double sum;
	cin>>n;
	int x[n],y[n],z[n],s[n];
	for(int i=0;i<n;i++){
		cin>>x[i]>>y[i]>>z[i];
	}
	for(int i=0,j=1;i<n-1,j<n;i++,j++){
		s[i]=(x[i]-x[j])*(x[i]-x[j])+(y[i]-y[j])*(y[i]-y[j])+(z[i]-z[j])*(z[i]-z[j]);
	}
	for(int i=0;i<n;i++){
		sum+=s[i];
	}
	cout<<sum;
}