delete pics to save space

2.11054.cpp

@@ -0,0 +1,20 @@
+#include<iostream>
+#include<algorithm>
+using namespace std;
+int main()
+{
+	cin.tie(0);
+	int n;
+	while(cin>>n&&n)
+	{
+		long long ans=0,a,last=0;
+		for(int i=0;i<n;i++)
+		{
+			cin>>a;
+			ans+=abs(last);
+			last+=a;
+		}
+		cout<<ans<<"\n";
+	}
+	return 0;
+}