struct node{
int data;
struct node* left;
struct node* right;
};
struct node* lca(struct node* root,struct node* a,struct node* b){
if(!root) return NULL;
if( root==a || root ==b) return root;
struct node* left = lca(root->left,a,b);
struct node* right = lca(root->rig
*Question 1 / 1*
Given an integer *N*, there are *2^N* binary codewords of length N. All of
them are taken and sorted to create a sequence: Sort by the number of 1-bits
in the codeword bit-string. If there is a tie, break tie so that the smaller
number comes first in the output sequence
*Testcases
