Submission

Score: 0

User: lingusso

Problemset: ติดตั้งหลอดไฟ

Language: cpp

Time: 0.003 second

Submitted On: 2026-03-25 13:33:45

#include<iostream>
#include<string>
using namespace std;

int main(){
	int n,a,sum=0,l=0;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a;
		l += a;
		sum = sum + (l*2);
	}
	cout<<sum;
	return 0;
}