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package class11;
public class Code07_PaperFolding {
public static void printAllFolds(int N) {
process(1, N, true);
System.out.println();
}
// 当前你来了一个节点，脑海中想象的！
// 这个节点在第i层，一共有N层，N固定不变的
// 这个节点如果是凹的话，down = T
// 这个节点如果是凸的话，down = F
// 函数的功能：中序打印以你想象的节点为头的整棵树！
public static void process(int i, int N, boolean down) {
if (i > N) {
return;
process(i + 1, N, true);
System.out.print(down ? "凹 " : "凸 ");
process(i + 1, N, false);
public static void main(String[] args) {
int N = 4;
printAllFolds(N);
