public static void expand() {
int n = BinaryStdIn.readInt();
int w = DNA.lgR();
for (int i = 0; i < n; i++) {
char c = BinaryStdIn.readChar(w);
BinaryStdOut.write(DNA.toChar(c));
}
BinaryStdOut.close();
StdOut.println();
StdOut.println();
}
public static void compress() {
String s = BinaryStdIn.readString();
int n = s.length();
BinaryStdOut.write(n);
for (int i = 0; i < n; i++) {
int index = DNA.toIndex(s.charAt(i));
BinaryStdOut.write(index, DNA.lgR());
}
BinaryStdOut.close();
}