1 # include<iostream>
 2 # include<cstdio>
 3 using namespace std;
 4 int inorder(int i,int j)
 5 {
 6     if(i<=j)
 7         printf("%d ",i);
 8     if(2*i<=j)
 9         inorder(2*i,j);
10     if(2*i+1<=j)
11         inorder(2*i+1,j);
12     return 1;
13 }
14 int main()
15 {
16     inorder(1,5);
17 }

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