dfbdhd
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package fsf;
public class Sfsdf {
static char[] data={0,'A','B','C','D','E','F','G'};
static int SIZE=data.length;
public static void preOrder(int N){
if(N>=SIZE/2){
System.out.print(data[N]+" ");
return ;
}
System.out.print(data[N]+" ");
preOrder(N*2);
// System.out.print(data[N]+" ");
preOrder(N*2+1);
}
public static void main(String[] args){
preOrder(1);
}
}
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