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public void mergesort(int low, int high) {
 
if (low < high) {
int middle_1 = (low + high) / 3;
int middle_2 = ((low + high) - middle_1) / 3;
System.out.println("split: " + numbers(low, high) + "." + " ");
System.out.println(" " + numbers(low, middle_1) + "." + " ");
System.out.println(" " + numbers(middle_1 + 1, middle_2) + "." + " ");
System.out.println(" " + numbers(middle_2 + 1, high) + "." + " ");
System.out.println();
mergesort(low, middle_1);
mergesort(middle_1 + 1, middle_2);
mergesort(middle_2 + 1, high);
merge(low, middle_1, middle_2, high);
} else {
return;
}
}

Main.java:2: class, interface, or enum expected
public void mergesort(int low, int high) {
       ^
Main.java:6: class, interface, or enum expected
int middle_2 = ((low + high) - middle_1) / 3;
^
Main.java:7: class, interface, or enum expected
System.out.println("split: " + numbers(low, high) + "." + " ");
^
Main.java:8: class, interface, or enum expected
System.out.println(" " + numbers(low, middle_1) + "." + " ");
^
Main.java:9: class, interface, or enum expected
System.out.println(" " + numbers(middle_1 + 1, middle_2) + "." + " ");
^
Main.java:10: class, interface, or enum expected
System.out.println(" " + numbers(middle_2 + 1, high) + "." + " ");
^
Main.java:11: class, interface, or enum expected
System.out.println();
^
Main.java:12: class, interface, or enum expected
mergesort(low, middle_1);
^
Main.java:13: class, interface, or enum expected
mergesort(middle_1 + 1, middle_2);
^
Main.java:14: class, interface, or enum expected
mergesort(middle_2 + 1, high);
^
Main.java:15: class, interface, or enum expected
merge(low, middle_1, middle_2, high);
^
Main.java:16: class, interface, or enum expected
} else {
^
Main.java:18: class, interface, or enum expected
}
^
13 errors

Standard output is empty