JAVA AND PYTHON_B7 java practice problem 2
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import java.util.Scanner;
import static java.lang.System.*;
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(in);
double n = scan.nextDouble();
double sumX = 0;
double sumW = 0;
ArrayList<Double> ws = new ArrayList<Double>();
for (double i = 0; i < n; ++i) {
double w = scan.nextDouble();
ws.add(w);
}
for (double i = 0; i < n; ++i) {
double x = scan.nextDouble();
sumX += x;
sumW += ws.get((int)i) * x;
}
out.println(sumW / sumX);
}
}
Java
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