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	Scanner s =new Scanner(System.in);
 
int c=0, casos=s.nextInt();
 
while (c<casos) {
 
int v1[]=new int[s.nextInt()];
 
for (int i = 0; i < v1.length; i++) {
 
v1[i]=s.nextInt();
 
}
 
int cont=0;int v2[]=new int[v1.length];
 
for (int i = 0; i < v2.length; i++) {
 
v2[i]=s.nextInt();
 
}
 
Arrays.sort(v1);
 
Arrays.sort(v2);
 
for (int i = 0; i < v2.length; i++) {
 
cont+=v1[i]*v2[i];
 
}
 
System.out.println(cont);
 
 
c++;
 
}
 
}
 
}

Main.java:1: error: class, interface, or enum expected
	Scanner s =new Scanner(System.in);
	^
Main.java:3: error: class, interface, or enum expected
int c=0, casos=s.nextInt();
^
Main.java:5: error: class, interface, or enum expected
while (c<casos) {
^
Main.java:9: error: class, interface, or enum expected
for (int i = 0; i < v1.length; i++) {
^
Main.java:9: error: class, interface, or enum expected
for (int i = 0; i < v1.length; i++) {
                ^
Main.java:9: error: class, interface, or enum expected
for (int i = 0; i < v1.length; i++) {
                               ^
Main.java:13: error: class, interface, or enum expected
}
^
Main.java:15: error: class, interface, or enum expected
int cont=0;int v2[]=new int[v1.length];
           ^
Main.java:17: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
^
Main.java:17: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
                ^
Main.java:17: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
                               ^
Main.java:21: error: class, interface, or enum expected
}
^
Main.java:25: error: class, interface, or enum expected
Arrays.sort(v2);
^
Main.java:27: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
^
Main.java:27: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
                ^
Main.java:27: error: class, interface, or enum expected
for (int i = 0; i < v2.length; i++) {
                               ^
Main.java:31: error: class, interface, or enum expected
}
^
Main.java:36: error: class, interface, or enum expected
c++;
^
Main.java:38: error: class, interface, or enum expected
}
^
19 errors

Standard output is empty