import java.io.*;
public class Main {
String[] cases1
= read.
readLine().
split(" "); int cases
= Integer.
parseInt(cases1
[0]),couples
; int sum=0,a,b,positionA=0,positionB=0,i=0;
for (i=0;i<cases;i++){
cases1 = read.readLine().split(" ");
couples
= Integer.
parseInt(cases1
[0]); A[0] = read.readLine().split(" ");
B[0] = read.readLine().split(" ");
for(int g=0;g<couples;g++){
for(int c=1;c<couples;c++){
positionA=c;
}
positionB=c;
}
}
sum = sum + (a*b);
A[0][positionA]="0";
B[0][positionB]="0";
}
result = result + " " + sum;
sum = 0;
}
finall = result.split(" ");
for(i=0;i<=cases;i++){
System.
out.
println(finall
[i
]); }
}
}
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